2016 NCERA – 137 Soybean Diseases Final Report€¦ · The meeting of the NCERA 137 Soybean...
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Minutes of the NCERA – 137 Soybean Diseases Technical Committee Meeting March 10-11, 2016 – Pensacola Beach, FL Administrative Advisor: Dr. Steven Slack Director, OARDC 1680 Madison Ave. Wooster, OH 44691 Chair: Dr. Nathan Kleczewski, Department of Plant and Soil Sciences and Cooperative Extension, University of Delaware, Newark, DE 19716 Secretary: Dr. Damon Smith, Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706 Immediate Past Chair: Dr. Heather Young-Kelly, Department of Entomology and Plant Pathology Tennessee University Jackson, TN 38301 Members and guests in attendance: Nathan Kleczewski (University of Delaware), Hillary Mehl (Virginia Tech), Ed Sikora (Auburn University), Tony Adesemoye (University of Nebraska), Scott Isard (Pennsylvania State University), Anne Dorrance (Ohio State University), Tom Welacky (OSACC), Tristan Mueller (Iowa Soybean Association), John Rupe (University of Arkansas), Alison Robertson (Iowa State University), Febina Mathew (South Dakota State University), Jing Zhou (University of Arkansas), Frank Zhao (University of Illinois), Laura Sweets (University of Missouri), Dean Malvick (University of Minnesota), Danise Beadle (Eurofins AgScience), Patricia Bollich (Louisiana State University Ag Center), Heather Kelly (University of Tennessee), Clayton Hollier (Louisiana State University Ag Center), Jim Kurle (University of Minnesota), Steven Slack (Ohio State University and NCERA 137 Administrative Advisor), Terry Niblack (Ohio State University), Travis Faske (University of Arkansas), Tom Allen (Mississippi State University), Sam Markell (North Dakota State University), Kiersten Wise (Purdue University), Carl Bradley (University of Kentucky), Daren Mueller (Iowa State University), Damon Smith (University of Wisconsin-Madison), Loren Giesler (University of Nebraska), James Haudenshield (USDA-ARS Urbana, IL), Yuba Kandel (Iowa State University), Ahmad Fakhoury (Southern Illinois University), Arjun Subedr (Southern Illinois University), Jason Bond (Southern Illinois University), Doug Jardin (Kansas State University), Kelly Whiting (United Soybean Board), Trey Price (Louisiana State University Ag Center) The meeting of the NCERA 137 Soybean Diseases Committee was held in Pensacola Beach Florida at the Hilton hotel on March 10-11, 2016. Dr. Nathan Kleczewski welcomed attendees at 2:00pm on March 10. Group introductions followed the welcome. Brief oral reports on the status of the soybean crop and prevalent diseases were given for each state with a member present. Written reports were also provided and compiled with the final report. The following presentations were given at the meeting: • Kelly Whiting: USB Updates 1. Compliments to the group for strong cooperation and working together to solve soybean disease problems. 2. USB values the pathologists and all they do.
Transcript of 2016 NCERA – 137 Soybean Diseases Final Report€¦ · The meeting of the NCERA 137 Soybean...
MinutesoftheNCERA–137SoybeanDiseasesTechnicalCommitteeMeetingMarch10-11,2016–PensacolaBeach,FL
AdministrativeAdvisor:Dr.StevenSlackDirector,OARDC1680MadisonAve.Wooster,OH44691Chair:Dr.NathanKleczewski,DepartmentofPlantandSoilSciencesandCooperativeExtension,UniversityofDelaware,Newark,DE19716Secretary:Dr.DamonSmith,DepartmentofPlantPathology,UniversityofWisconsin-Madison,Madison,WI53706ImmediatePastChair:Dr.HeatherYoung-Kelly,DepartmentofEntomologyandPlantPathologyTennesseeUniversityJackson,TN38301Membersandguestsinattendance:NathanKleczewski(UniversityofDelaware),HillaryMehl(VirginiaTech),EdSikora(AuburnUniversity),TonyAdesemoye(UniversityofNebraska),ScottIsard(PennsylvaniaStateUniversity),AnneDorrance(OhioStateUniversity),TomWelacky(OSACC),TristanMueller(IowaSoybeanAssociation),JohnRupe(UniversityofArkansas),AlisonRobertson(IowaStateUniversity),FebinaMathew(SouthDakotaStateUniversity),JingZhou(UniversityofArkansas),FrankZhao(UniversityofIllinois),LauraSweets(UniversityofMissouri),DeanMalvick(UniversityofMinnesota),DaniseBeadle(EurofinsAgScience),PatriciaBollich(LouisianaStateUniversityAgCenter),HeatherKelly(UniversityofTennessee),ClaytonHollier(LouisianaStateUniversityAgCenter),JimKurle(UniversityofMinnesota),StevenSlack(OhioStateUniversityandNCERA137AdministrativeAdvisor),TerryNiblack(OhioStateUniversity),TravisFaske(UniversityofArkansas),TomAllen(MississippiStateUniversity),SamMarkell(NorthDakotaStateUniversity),KierstenWise(PurdueUniversity),CarlBradley(UniversityofKentucky),DarenMueller(IowaStateUniversity),DamonSmith(UniversityofWisconsin-Madison),LorenGiesler(UniversityofNebraska),JamesHaudenshield(USDA-ARSUrbana,IL),YubaKandel(IowaStateUniversity),AhmadFakhoury(SouthernIllinoisUniversity),ArjunSubedr(SouthernIllinoisUniversity),JasonBond(SouthernIllinoisUniversity),DougJardin(KansasStateUniversity),KellyWhiting(UnitedSoybeanBoard),TreyPrice(LouisianaStateUniversityAgCenter)ThemeetingoftheNCERA137SoybeanDiseasesCommitteewasheldinPensacolaBeachFloridaattheHiltonhotelonMarch10-11,2016.Dr.NathanKleczewskiwelcomedattendeesat2:00pmonMarch10.Groupintroductionsfollowedthewelcome.Brieforalreportsonthestatusofthesoybeancropandprevalentdiseasesweregivenforeachstatewithamemberpresent.Writtenreportswerealsoprovidedandcompiledwiththefinalreport.Thefollowingpresentationsweregivenatthemeeting:• KellyWhiting:USBUpdates
1. Complimentstothegroupforstrongcooperationandworkingtogethertosolvesoybeandiseaseproblems.
2. USBvaluesthepathologistsandalltheydo.
3. USBabouttolaunchanew5-yearstrategicplan–Newfocusareasandprioritieswillbeidentifiedasthisisdeveloped.
§ “Sustainability”willlikelybeastrongfocusinthenewplan§ “Bigdata”willlikelybeanotherstrongfocusforthenewplan
4. Anotherprioritycomingwillbeanincreasedfocusondeliveringthe“message”tofarmersafterresearchiscomplete.Demonstratingapositivereturnoninvestment(ROI)fortheresearchfundedbytheUSBisgainingevenmoreimportance.
5. Morediseasemonitoringandtrackingcanhelpdeliverdiseaseinformationtothefarmer–predictivediseasemodelsmightbeahelpfulpriorityarea.
• SteveSlack-Remarksandintroductions1. NCERA137doesanexcellentjobofcollaborating;oneofthebestNCERAgroups
asfarascollaboration(ex.Soybeanrustworkersandwarningsystemthatwasaspin-offgroupfromNCERA137).
2. Alsoapplaudedthegroupforlookingatprioritiesandcombiningthesoybeanvirus,soybeanrust,andsoybeandiseaseworkinggroupbacktoonegrouptobefreshandefficient.
3. Needanannualreportdue60daysaftercompletionofmeeting4. Needaterminationreportfromthevirusgroupandthesoybeanrustgroup.
ThesereportsaredueattheendofSeptember2016. 5. TerryNiblack(OSU)willbethenewNCERA137administrativeadvisorafter
SteveSlackretiresthisfall • HillaryMehl:DevelopmentandOptimizationofaWeather-BasedDecisionAidforSoybean
FoliarFungicideApplications1. On-farmtrialswereusedtoadjustparametersforanewweather-basedmodelto
predicttheneedforfungicideapplicationattheR3soybeangrowthstage.2. Preliminarydatashowsomesuccessinpredictingfungicideapplication,however,
somerefinementisneeded• HeatherYoungKelly:TheStoryofSoybeanRustintheU.S.
1. Asynopsisofsoybeanrustresearchandmanagementprogresswasprovided • LorenGiesler:CouldtheMovementtoConventionalHerbicidesResultinMoreSeedling
DiseaseProblems? 1. Aconversationaboutthetransitionbacktoconventionalherbicidesandthe
possibleinteractionstheseproductsmighthavewithdiseaseanddiseaseassessmentinsoybean.
• JasonBond:SeedlingDiseasesofSoybeanRegionalProjects:Biology,ManagementandEducation
1. Anupdateoffundedresearchonsoybeanseedlingdiseaseswasprovidedtothefullgroup.
• TristanMueller:On-FarmEvaluationofFungicidesonSoybeansandNCSRPUpdate1. InformationaboutthemissionoftheOn-FarmNetworkwasprovided2. Datafromsoybeanfungicideon-farmtrialsfromIowawaspresented3. Datafromtheon-farmstriptrialsisverysimilartouniversitysmall-plottrials
• JingZhou:EpidemiologicalattributesofSoybeanveinnecrosisvirus--Anupdatefromrecentfindings
1. BackgroundandintroductionofSVNVwasprovided2. SoybeanthripsisanefficientvectorofSVNV3. WesternflowerthripswereshownnottobeabletotransmitSVNVincontrolled
experiments4. Ivy-leafmorninggloryseemstobeagoodalternativehostforbothSVNVand
soybeanthrips5. Demonstrated100%transmissionefficiencyofSVNVtokudzuusingsoybean
thrips6. ShowedthatSVNVcanbesystemicinmixedvirusinfectionwithBPMVandSMV
• CarlBradley-FungicidemanagementoffrogeyeleafspotcausedbyQoI-resistantCercosporasojina
1. AnupdateofUSBfundedfrogeyeleafspotandstrobilurinresistancefieldresearchwaspresented
• AnneDorrance:QTLsforResistancetosoilbornepathogensofsoybean1. LargeamountofvariabilityinisolatesofPhytophthoraandPythiuminmany
northcentralandeasternstateswhereisolateswerecollected2. LotsofgenotypicvariabilityinPhytophthorasojaeisolates3. Needtocontinuebreedingeffortsforselectingandaccuratelycharacterizing
oomyceteresistanceinsoybean • AlisonRobertson:oomyceteCAPSprojectupdate
1. DiversespeciesofPythiumisolatesidentifiedinagronomicfields2. Diversearrayofisolatesalsomeansthattherearespeciesthatcaninfect
soybeansacrossawiderangeofsoiltemperatures3. Chilver’slabisalsoworkingoncharacterizingoomycetefungicidesensitivityto
seedtreatmentfungicides4. Chilver’slabhasalsodevelopedaseriesofmoleculardiagnostictechniquesto
identifyspeciesofPhytophthora • DamonSmith:Stemdiseasesandprojectupdatesintroduction
1. ProvidedanintroductiontonewresearchintheNorthCentralregionsponsoredbytheUSBandNCSRP
2. Outlinedprojectsunderwaytobetterunderstandthere-emergenceofstemdiseasesofsoybeanintheNorthCentralRegion
• FebinaMathew:SoybeanStemCanker:OverviewofRecentResearchDevelopments1. DescribednewexperimentstocharacterizethespeciesprofileoftheDiaporthe
complexintheNorthCentralRegion2. AdiscussionofthecurrentnamesofspeciesinvolvedintheDiaporthecomplex
followed • DeanMalvick:MacroandMicroSoybeanResponsestotheStealthDiseaseBrownStemRot
1. Apresentationofrecentresearchonbrownstemrotinsoybeanandsomemanagementpracticeupdateswereprovided.
• TomAllen:Screeningcommercialsoybeangermplasmforresistancetosouthernstemcanker
1. DescribedthestemcankersituationintheMississippiDelta2. Providedasynopsisofresearchinvestigatingresistancetostemcankerin
southernsoybeancultivars • DamonSmith,MartinChilvers,andMamadouFall:UpdateonSclerotiniaStemRot
EpidemiologyandForecastingResearch1. Detailedinformationpertainingtofungicideevaluationsforwhitemoldcontrol,
andalsoapothecialmappingandpredictionmodeldevelopmentwaspresentedtothegroup
2. Improvementstothemodelingeffortswerediscussedamongthegroup• MartyDraper-UpdatesfromNIFA
1. ProvidedadetailedupdateonupcomingNIFAfundingopportunities2. ProvidedseveralsuggestionsoncriticalpointsdesiredbyNIFAfundingpanelsto
improvethepossibilityofobtainingfundingwhensubmittingproposals–besuretofollowthespecifiedguidelines
BusinessMeeting:Motiontoapprovetheminutesfrom2015:Dr.DougJardinemovedtoapprove.Dr.TonyAdesemoyeseconded.Themotionpassedwithunanimousvote.SecretaryNomination: AnominationforsecretarywassubmittedbyDr.DamonSmith.ThenomineewasDr.DarenMueller.Dr.Mulleracceptedthenomination.Othernominationswererequested.Withnoothernominations,Dr.TomAllenmadethemotionthatDr.Muellershouldbetheincomingsecretary(2016)andfuturecommitteechair(2017).Dr.DougJardinesecondedthemotion.Dr.Muellerwaselectedunanimouslybyvoicevote.MeetingLocation:Dr.DamonSmithsuggestedthatthe2017NCERA137meetingmightbeheldinconjunctionwiththeWorldSoybeanCongressinSavannah,GA.TheWorldSoybeanCongressistobeheldonSeptember10-16,2017.GiventhedatesoftheWorldSoybeanCongress,thegroupfeltthatthiswasnotagoodtimeoftheyearfortheNCERA137tomeet.Dr.TomAllensuggestedthatNCERA137mightagainmeetinconjunctionwiththeSouthernSoybeanDiseaseWorkersmeetingtobeheldonMarch8-9,2017inPensacolaBeachFlorida.Dr.AnneDorrancemadethemotionthatNCERA137meetstartingintheafternoononMarch7,2017inPensacolaBeachwiththemeetingtoproceedtothemorningofMarch8,2017.TheSouthernSoybeanDiseaseWorkersmeetingwouldcommenceontheafternoonofMarch8,2017.Dr.TravisFaskesecondedthemotion.Themotionpassedunanimouslybyvoicevote.Dr.SmithwillworkwithrepresentativesoftheSouthernSoybeanDiseaseWorkerstoplanthe2017NCERA137meeting.
OtherAnnouncements:Dr.AnneDorranceannouncedthattheSoy2016meetingwouldbeheldinColumbusOhioonAugust7-10,2016.Recognition:Dr.StevenSlackwasrecognizedastheNCERA137AdministrativeAdvisor.HewascongratulatedonhisretirementwithagiftofappreciationpresentedbyDr.LauraSweetsandDr.AnneDorranceandhonoredwithastandingovationforhisyearsofexcellentservicetoNCERA137.Adjournment:Amotiontoadjournthe2016NCERA137wasmadebyDr.TomAllenat11:00am.ThemotionwassecondedbyDr.TravisFaske.
StateReports,State-BasedImpactStatementsandPublications
Alabama
EdwardSikora,ExtensionPlantPathologist,AuburnUniversity
AuburnUniversitypersonnelinvolvedinsoybeandiseaseextensionandresearch:EdSikora,DennisDelaney,KassieConner,AlanaJacobson,MaryDelaneyJohhMurphy,JoeKemble
InAlabamaatotalof500,000acresofsoybeanswereplantedin2015with490,000acresharvested.Thestatewideaverageyieldwas41.0bushelsperacre.
ThespringwasverywetinAlabamaforcingsomeverylateplantingsofsoybeaninthestate.TheweatherturnedhotanddryfromlateJulythroughearlyOctoberresultinginavarietyofsoybeandiseasestodevelopduringtheseason.Charcoalrotandstemcankerwerethemostdamagingdiseasenotedduringtheseason.A90%yieldlosswasreportedfromafieldincentralAlabamamostlikelyfromcharcoalrot.Stemcankerwasalsoayield-reduceronsusceptiblevarietiesthroughoutmuchofcentralAlabama.Frogeyeleafspotwasthemostcommonfoliardiseaseobservedin2015andresultedingrowersincentralandNorthAlabamasprayingforthepathogen.Soybeanrustwasobservedlateintheseasonbutresultedinonlyminoryieldlossesindouble-croppedsoybeansinafewcounties.SoybeanVeinNecrosisViruscontinuedtobeaconcerninNorthAlabamawhereincidenceof80-100%wascommoninfieldsinNorthAlabamaandthediseaseappearedtobeincreasinginwasbecomingmorevisibleincentralandsouthwestAlabama.
ImpactStatements
1. Tookpartinamulti-stateefforttodeterminetheimpactofsoybeanveinnecrosisdisease(SVND)onsoybeanyieldandseedquality.SVNDeffectsseedqualityprimarilybyreducingseedoilcontent.
2. Conductedameta-analysisstudyonyieldandfungicidestodeterminetheoptimumtimingoffungicideapplicationformanagementofsoybeanrustandotherfoliardiseasesofsoybeaninthesoutheast.Inaddition,topperformingfungicideproductswereidentified.
Refereedjournalarticlesandbooks/bookchapters.
Hartman,G.L.,Rupe,J.C.,Sikora,E.F.,Domier,L.L.,Davis,J.A.,andSteffey,K.L.2015.CompendiumofSoybeanDiseasesandPests.APSPress.AmericanPhytopathologicalSociety,St.Paul,Minnesota,U.S.A.
Hartman,G.L.,E.J.SikoraandJ.C.Rupe.2015.Rust.In:CompendiumofSoybeanDiseasesandPests(5thEdition)
Symposiaandconferencepublications.
Sikora,E.J.,K.ConnerandL.Zhang.2015.MonitoringforSoybeanVeinNecrosisVirusinAlabama(2014).ProceedingsoftheSouthernSoybeanDiseaseWorkers42ndAnnualMeeting,Pensacola,FL.
ExperimentStationpublications
Sikora,E.J.,M.A.DelaneyandD.P.Delaney.2015.EvaluationoffoliarapplicationofFORTRIXforcontrolofsoybeanrust,2013.PlantDiseaseManagementReports9:STF.
Sikora,E.J.,M.A.DelaneyandD.P.Delaney.2015.EvaluationoffoliarapplicationsofTopguardSCforcontrolofsoybeanrust,2013.PlantDiseaseManagementReports9:STF.
DelaneyD.P.,E.J.SikoraandM.A.Delaney.2015.Evaluationoffoliarfungicidesforcontrolofsoybeanrust,2013.PlantDiseaseManagementReports9:STF.
DelaneyD.P.,E.J.SikoraandM.A.Delaney.2015.Evaluationoffoliarfungicidesforcontrolofsoybeanrust,2013.PlantDiseaseManagementReports9:STF.
DelaneyD.P.,E.J.SikoraandM.A.Delaney.2015.Evaluationoffungicidesforcontrolofsoybeanrust,2013.PlantDiseaseManagementReports9:STF.
Extensionpublications,factsheetsandE-alerts
Sikora,E.J.FrogeyeleafspotAlert:EmailAlert
Sikora,E.J.ManagementoffrogeyeleafspotinAlabama;EmailAlert
Sikora,E.J.Stemcankerofsoybeans;EmailAlert
Sikora,E.J.CharcoalrotandSuddenDeathSyndromeonsoybeans:EmailAlert
Sikora,E.J.SoybeanIPMrecommendationsforsoybeansinAlabama,2015(revision)
Arkansas
TravisFaske,ExtensionPlantPathologist,UniversityofArkansasSystemsDivisionofAgriculture
UniversityofArkansaspersonnelinvolvedwithNCERA137objectives:TravisFaskeandJohnRupeForthe2015croppingseason3.2millionacresofsoybeanwereplantedwith3.17millionacresharvested.Theaverageyieldwas49bu/A,whichisonebushellowerthan2014.Threeproducersexceeded100bu/Ayieldcontestagainin2015withthehighestaverageof108bu/A.
Environmentalconditionswereunseasonablycoolforthestartofthe2015croppingseason,whichcontributedtomoreseedlingdiseaseconcernsthannormal.ManyoftheseissueswereinteractionwithorsolelycausedbyPPOherbicides.Stemcankerweredetectedasindividualscatteredplantsinafewfields,whichismorethanusual.ThesouthernRKNisourmostyieldlimitingissueandmostimportantsoybeannematodeinArkansas.Manycottonfarmersoptedtoplantsoybean,whichcontributedtoahigheryieldlossbyRKNthaninpreviousyears.Othersoilbornediseaseissuesconsistedofcharcoalrotinthesouthernpartofthestatewhereneardroughtconditionspersistedduringmid-season.FrogeyeleafsspotcontinuestobethemostproblematicfoliardiseaseandQoI-resistantstrainshavenowbeendetectedin27counties,whichplantover90%oftheArkansassoybeancrop.Soybeanrustdidreturntothestatein2015andwasdetectedin14counties.Asinpreviousyearthisdiseasearrivedtoolatetoaffectthe2015soybeancrop.Ofthefoliarsoybeandisease,targetspotandbrownspotweremorefrequentlydetectedinnorthcentralArkansas.
JournalArticlesAbstracts:Faske,T.R.2015.AssessmentofSeveralCommerciallyAvailableTriazoleandPremixFungicidesforManagementofFrogeyeLeafSpotinArkansas.ProceedingsoftheSouthernSoybeanDiseaseWorkersAnnualMeeting;March11-12;Pensacola,FL.Pp.36Jackson,C.S.andFaske,T.R.2015.AssessmentoffluopyramformanagementofMeloidogyneincognitaonsoybean.Phytopathology105:S2.5.
ProceedingsAllen,T.W.,Damicone,J.P.,Dufault,N.S.,Faske,T.R.,Hershman,D.E.,Hollier,C.A.,Isakeit,T.,Kemerait,R.C.,Kleczewski,N.M.,Koenning,S.R.,Mehl,H.L.,Mueller,J.D.,Overstreet,C.,Price,P.P.,Sikora,E.J.,andYoung,H.2015.SouthernUnitedStatesSoybeanDiseaseLoss
Estimatesfor2014.ProceedingsoftheSouthernSoybeanDiseaseWorkersAnnualMeeting;March11-12;Pensacola,FL.Pp.10-15.
PlantDiseaseManagementReportsEmerson,M.,Faske,T.R.,andHurd,K.2015.EvaluationofAffianceandDomarkforcontroloffrogeyeleafspotofsoybeaninArkansas,2014.PDMR9:FC134.
Emerson,M.,Faske,T.R.,andHurd,K.2015.EvaluationofanexperimentalfoliarfungicideforcontroloffrogeyeleafspotofsoybeaninArkansas,2014.PDMR9:FC133.
Emerson,M.,Faske,T.R.,andHurd,K.2015.EvaluationofStrategoYLDformanagementoffrogeyeleafspotofsoybeaninArkansas,2014.PDMR9:FC135.
Emerson,M.,Faske,T.R.,andHurd,K.2015.EvaluationofCercobinandTopsinonsoybeansformanagementoffrogeyeleafspotinArkansas,2014.PDMR9:FC132.
ExtensionPublications:
Faske,T.R.SoybeanrustspreadinginArkansas,Univ.ofArkansasRowCropsBlog(9/21)
Faske,T.R.SoybeanrustreturnstoMid-South,buthasyettobedetectedinArkansas,Univ.ofArkansasRowCropsBlog(9/8)Faske,T.R.Keypointstoconsiderforfrogeyeleafspotcontrol,Univ.ofArkansasRowCropsBlog(8/21)Faske,T.R.Triazolephytotoxicityvs.suddendeathsyndromesymptoms15onsoybean,Univ.ofArkansasRowCropsBlog(8/14)
Faske,T.R.Soybeanseedlingdiseasevs.herbicideinjury,Univ.ofArkansasRowCropsBlog(5/19)
Delaware
NathanKleczewski,ExtensionPlantPathologist,UniversityofDelaware
UniversityofDelawarepersonnelinvolvedinsoybeandiseaseextensionandresearch:NathanKleczewski,AndyKness,ChristopherRamage,NathanSmith
InDelawareatotalof175,000acresofsoybeanswereplantedin2015,down10,000acresfrom2014.Statewideaverageswere40bu/A,downfrom47.5bu/Ain2014.Approximately50,000acreswereirrigated,andyielded48.5bu/Avs36.5bu/Afordrylandbeans.
2015wascharacterizedbyprolongedperiodsofdry,hotweathersurroundedbybriefpatchesofheavyrain.Consequently,growerswithirrigationwereabletocompensateforthelackofwaterduringcrucialperiodsofplantgrowth,resultingintheroughly12bu/Aincreaseinproductionwhencomparingirrigatedtodrylandbeans.Septoriabrownspotwasobservedinthelowercanopiesofsomecultivars,butoftenwasnotatlevelsthatwouldhavecausedasignificantlossinyield.Downymildewwaspresentatlowlevelsinsomeareaswithpoorairfloworirrigatedareas,butquicklydissipatedwhentemperaturesincreased.Frogeyeleafspotwaspresentatverylowlevelsinfewfields,mostlythosereceivingsupplementalirrigation.Charcoalrotwaspresentinmanydrylandfields,andRKNcausedsignificantdamageinfieldsinSussexandDovercounties.Soybeancystnematodecontinuestobedetectedthroughoutthestate,andfewcontroloptionsareavailabletogrowersduetolackofalternativeresistancesources.Althoughtherewassomestemcankerpresent,itwasoftennotpossibletodetermineitsimpactonyieldasmanyfieldswereseverelyinfestedwithDectesstemborerlateintheseason.Greenstemwasalsoprevalentthroughoutthestate,butthiswasbelievedtobearesultofenvironmentalfactors,notduetopestorpathogenissues.SVNVwasdetectedinthemajorityoffields,withdoublecropbeansbeingmoreseverelyimpactedthanfullseasonbeans.Otherviruseswerenotedbutnotidentified,butwerelikelySMV,tobaccoringspot,andorAMV.Aunique,“Orangespot”symptomwasagainnotedinsomefields.
ImpactStatements
1. ConductedasurveyandsmallplotresearchonSVNVinDelawareandMaryland.Showedthatdoublecropbeansmaybemoreseverelyaffectedbythevirus,thatvarietiesdifferinsymptomexpression,andthatsymptoms,intermsofaffectedfoliageintheupper1/3ofthecanopy,correlatednegativelywithyieldinvarietiestested.Sequentialinsecticidetreatmentsinresearchplotsreducedthripsbutdidnotimpactviralspread,indicatingthatifmanagementisrequired,itlikelywillberelatedtoplantingdateandvarietyselection.
2. Developedmultiplesoybeandiseasefactsheetsavailableforprintingandviewing3. Conductedsoybeantrialsforwhitemoldandbrownspot.Datawereusedfortraining
growersonappropriatetimingandproductselectionformanagingwhitemold.Datawasalsosharedwithotherresearchersaspartofalargescalemetaanalysisoffungicidetimingsinwhitemoldmanagement.
4. IsolatedPhytophthoracapsicifromsoybeanstems.Althoughtheorganismdoesnotappeartobepathogenicinsoybeans,itisanissueinvegetableproduction.IntheprocessofcompletingpreliminaryexperimentstodeterminepotentialimpactonP.capsiciepidemiology.
ResearchPublications,ExtensionArticles,andVideos
AbstractsandPosters
1. N.M.Kleczewski,B.Cissel,andJ.Whalen.OccurrenceandImpactofSoybeanVeinNecrosisDiseaseinDelawareSoybeans.NEMeetingoftheAmericanPhytopathologicalSociety,Philadelphia,PA,2015.
Extension/Outreachpublications/blogs/webarticles(Totalof28)
1. Kleczewski,N.M.andK.Everts.2016.2015AppliedPlantPathologyResearchBook.2. Kness,A.,andKleczewski,N.M.Charcoalrotinsoybeans.UniversityofDelaware
CooperativeExtensionFactsheet.Availableat3. Kness,A.andKleczewski,N.M.2015.RootKnotNematodeonSoybean.Universityof
DelawareCooperativeExtensionFactsheet.Availableat:http://extension.udel.edu/factsheets/root-knot-nematode-in-soybeans/
4. Kleczewski,N.M.,Mehl,H.etal.2015.PestManagementGuide:FieldCrops.VirginiaTechCooperativeExtension(updatedannually).(Availableonlineat:http://pubs.ext.vt.edu/456/456-016/456-016.html)Fieldcropsdiseasemanagementblog–10articlespertainingtosoybeandiseasemanagementlocatedat:http://extension.udel.edu/fieldcropdisease/WeeklyCropUpdate-14articlespertainingtosoybeandiseasemanagement.Online
archiveslocatedat:http://extension.udel.edu/weeklycropupdate/
IndianaKierstenWise,ExtensionPlantPathologist,PurdueUniversityPurduepersonnelinvolvedwithsoybeandiseaseactivities:KierstenWise,VirginiaFerris,JamalFaghihi,GailRuhl,andTomCreswell
In2015,approximately5.5millionacresofIndianacroplandwereinsoybeanproduction.Theaverageyieldwas50bu/A,whichwassimilarto2013-2014totalsforproductionandyield.
Theimpactofsoil-bornediseasesofsoybeanwashighin2015.Excessiverainfallandcool,wetconditionsinearlyspringresultedinseedlingdiseaseproblemsacrossmostofthestate.Foliardiseasessuchasbrownspot,frogeyeleafspot,anddownymildewwerepresent,butatlowlevelsthroughoutthestate.Suddendeathsyndrome(SDS)waspatchyinareas,butwasnotassevereas2014.Brownstemrotandstemcankerwerealsopresent,andmayhavelimitedyieldinsomefields.Soybeanveinnecrosisvirus(SVNV)waspresent,andwaswidespreadacrossthestate,butnotsevere.Personnelparticipatedinmonitoringforsoybeandiseases,includingsoybeanrust,anddistributeddiseaseobservationsthroughthePurduePestandCropNewsletter.
ImpactStatement:
1. Ledamulti-stateefforttodetermineenvironmentalandproductionfactorsthatinfluencecharcoalrotdevelopmentinsoybean.
2. Examinedimpactofproductionfactors,suchasplantingdate,fungicideseedtreatment,irrigation,herbicideprogram,andvarietyselectiononsuddendeathsyndromedevelopmentinsoybean.
3. Indianaparticipatedinmulti-statesoybeanseedlingsamplingprojectstodeterminetheprevalenceanddistributionofsoil-bornefungiandfungal-likeorganismsassociatedwithseedlingblight.
Publications:
Dorrance,A.E.,Kurle,J.*,Robertson,A.E.,Bradley,C.,Giesler,L.,Wise,K.andConcibido,V.C.2016.PathotypediversityofPhytophthorasojaeintenstatesintheUnitedStates.PlantDisease.(Inpress).
Sexton,Z.,Hughes,T.J.,andWise,K.A.*2016.AnalyzingisolatevariabilityofMacrophominaphaseolinafromaregionalperspective.CropProtection.(Inpress)
Olson,T.R.,Gebreil,A.,Micijevic,A.,Bradley,C.A.,Wise,K.A.,Mueller,D.S.,Chilvers,M.I.,andMathew,F.M.*2015.AssociationofDiaporthelongicollawithblackzonelinesonmaturesoybean(GlycinemaxL.)plants.PlantHealthProgress.doi:10.1094/PHP-RS-15-0020.KandelY.R.,Bradley,C.A.,Wise,K.A.,Chilvers,M.I.,Tenuta,A.U.,Davis,V.M.,Esker,P.D.,SmithD.L.,LichtM.A.andMueller,D.S.2015.Effectofglyphosateapplicationonsuddendeathsyndromeofglyphosate-resistantsoybeanunderdifferentfieldconditions.PlantDis.99:347-354.
ExtensionPublications:
Tenuta,A.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,MuellerD.,Sisson,A.,Smith,D.,Wise,K.2015.ScoutingforCommonSoybeanDiseases.CPN-1001.Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,Smith,D.,Tenuta,A.2015.ScoutingforSoybeanStemDiseases.CPN-1002.Bloomingdale,C.,Bradley,C.,Chilvers,M.,Giesler,L.,Groves,R.,Mueller,D.,Smith,D.,Tenuta,A.,Wise,K.2013(Revised2015).SoybeanVeinNecrosisVirus.CPN-1003.Smith,D.,Chilvers,M.,Dorrance,A.,Hughes,T.,Mueller,D.,Niblack,T.,Wise,K.2015.CharcoalRot.CPN-1004.
Mueller,D.,Bradley,C.,Chilvers,M.,Esker,P.,Malvick,D.,Peltier,A.,Sisson,A.,Wise,K.2015.WhiteMold.CPN-1005.Wise,K.,Bradley,C.A.,Chilvers,M.,Giesler,L.Mathew,F.,Mueller,D.,Smith,D.,Tenuta,A.2015.StemCanker.CPN-1006.Mueller,D.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Smith,D.,Tenuta,A.,andWise,K.2015.PodandstemblightandPhomopsisseeddecay.CPN-1007.Wise,K.,Bradley,C.,Giesler,L.Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,Noveroske,A.Sisson,A.,Tenuta,A.,Young-Kelly,H.2015.SoybeanSeedlingDiseasesCPN-1008.Wise,K.,Bradley,C.,Chilvers,M.Giesler,L.Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,Noveroske,A.Sisson,A.,Tenuta,A.,Young-Kelly,H.2015.ScoutingforSoybeanSeedlingDiseases.CPN-1009.
Mueller,D.,Chilvers,M.,Giesler,L.,Sisson,A.,Tenuta,A.,Wise,K.2015.ScoutingforWhiteMoldinSoybean.CPN-1010.Wise,K.,andmembersoftheNCERA-137SoybeanDiseaseCommittee.2014,revised2015.FungicideEfficacyfortheControlofSoybeanSeedlingDiseasesBP-163-WWise,K.andmembersoftheNCERA-137SoybeanDiseaseCommittee.20132014,revised2015.FungicideEfficacyforControlofFoliarSoybeanDiseases.BP-162-W
Iowa
DarenMueller,ExtensionPlantPathologist,IowaStateUniversityIowaStateUniversitypersonnelinvolvedwithsoybeandiseaseactivities:LeonorLeandro,AlisonRobertson,GregTylka,X.B.Yang
Themajorsoybeanproblemsin2015weresuddendeathsyndrome,whitemoldandsoybeancystnematode.Stemcankerwasalsomoreprevalentthanintypicalyears.DiseasesthatpresentbutnotasseverewereSeptoriabrownspot,downymildew,Phyllostictaleafspot,andsomeviruses(tobaccostreak,soybeanveinnecrosisandsoybeandwarf).
ImpactStatements
IowaStatehasledamulti-stateprojectfocusedonmanagementofsuddendeathsyndromeofsoybean.ThefoundationalmanagementstrategyforSDSisusingresistantcultivars.However,inyearssuchas2010and2014,whenenvironmentalconditionsarefavorablefordiseasedevelopment,itisevidentthatresistancealonedoesnotprovideadequatecontrolorreducefarmerrisksufficiently.Also,SDScontinuestomoveintonewareas.Thus,themaingoalofthisprojectistoinvestigatemanagementoptionsthatwillhelpensureresistantcultivarswillbeaseffectiveaspossibletherebyreducingriskaswellasprovidingfarmerswithmaximumeconomicreturnontheirinvestmenteveninunusuallyconduciveSDSconditions.Heresomehighlightsfromthesestudies.
1. ExaminedtheeffectofglyphosateonSDS.StudyhasbeenpublishedinPlantDisease.StudyofeffectofinteractionbetweenherbicideandseedtreatmentonSDSisongoing.Wecollectedandanalyzedthefirstyeardata.
2. Completedamulti-labstudyevaluatingperformanceofsixqPCRassaysdevelopedforF.virguliforme.ThemanuscriptwassubmittedforpublicationtoPhytopathology.Inthisstudy,wecomparedthestrengthsandweaknessofallsixassaysunderdifferentresearchfacilitiesintermsoftheirspecificity,sensitivity,andconsistencyandalsoidentifiedaneffectiveprotocolforbetterdiagnosisandquantifySDSpathogen.Tosummarize,assaysdifferedintheirperformancesandalsotheperformanceofthesameassayvariedamongthelaboratories.AnassaydevelopedinChilverslabshowedthehighestsensitivityandthesecondhighestspecificity,andthusissuggestedasthemostusefulqPCRassayforF.virguliforme.ThisassayiscurrentlybeingusedforquantifyingF.virguliformepopulationinrootandsoilinotherobjectives.
3. IdentifiedseedtreatmentstoreduceSDSfoliarsymptoms.WecompletedastudyevaluatingplantingdateandseedtreatmenteffectonSDSdevelopment.Manuscriptsarebeingwrittentopeer-reviewedjournals.Tosummarize,ILeVOseedtreatmentreduceddiseaseseverityandincreasedyieldnearlyinallplantingsandcultivars,withamaximumyieldresponseupto21%(RolandIowa).EffectofplantingdateonfoliarSDSsymptomswasinconclusive.AlthoughMid-Juneplantingsdidnothavehigherdisease
thanearlyplantingsityieldedlowergrainupto19bu/AcomparedtoearlyMayplantings.
4. CollectedSCN,SDSandyielddatafromallparticipatingstatesanddataanalysisisbeingdone.
5. Testedthesusceptibilityof16covercropsspeciestoinfectionbyF.virguliforme.Foundthatlegumespeciestendtobesusceptibletoinfection,whereasgrassesandbrassicasarenot.
6. ConductedstudiestodeterminetheroleofethyleneonSDS.FoundthatapplicationoftheethyleneinducerethephontosoybeanreducesSDSseverity,andthatethephontreatmentresultsinoverexpressionofsoybeandefenserelatedgenes.
7. Presentedourpreliminaryresearchatprofessionalmeetings,onPlantManagementNetwork,gavenationalandinternationalseminars,mediainterviews,talkinfielddaysandconferencesforfarmersandalsopublishedinstatenewsletterarticles,20+mediareleasesetc.Tocommunicatewithresearchers,wealsopublishedorareintheprocessofpublishinginpeer-reviewedjournals.Wealsohadseveralpressreleases,includingsomejointlywithNCSRP,basedonresultsfromthisproject(e.g.,glyphosatestudy,ILeVOstudy).
IowaStatealsocollaboratesonmulti-stateprojectsregardingsoybeanseedlingdiseasepathogens.Asseedpricesincrease,farmersseedratesaredecreasing.Adecadeago,farmersweresowing>200,000seedperacre;todaytheyaresowing140,000to160,000.Moreover,farmersareplantingearlier,whichmeanssoilsareoftencoolerandwetter.Thisincreasestheriskofseedlingdisease.Consequentlyseedtreatmentuseisontheincrease.Thegoalofthesestudiesistoidentifywhatspeciesareseedlingpathogensandtoimproveourknowledgeoftheeffectofenvironmentandmanagementpracticesonseedlingdisease.ISUhighlightsfromthesestudiesinclude:
1. TemperatureaffectspathogenicityandfungicidesensitivityoffourPythiumspeciesrecoveredinIowa.ThisstudywaspublishedinPlantDisease.Wehavejustfinishedscreeningrepresentativeisolatesofthesefourspeciesfromthenorthcentralregionandaresummarizingdataandpreparingamanuscript.
2. CommercialseedtreatmentswereevaluatedatthreelocationsinIowain2014and2015.Despiteplantingearlyandpriortoaweeklongprecipitationeventandsoiltemperaturesdroppingbelow50F,noeffectofseedtreatmentonemergenceandyieldwasdetected.Thistrialisbeingrepeatedin2017,withinoculatedandnon-inoculatedplots.The2015datawerepublishedintheICMNewsletter(www.extension.iastate.edu/CropNews)and2015datawillbepublishedinSpring2016.
3. TheNAMparentswerescreenedforresistancetofivespeciesofPythium.Resistancewasdetectedinsomeparents.Amanuscripthasbeenprepared.WearecurrentlyscreeningtheNAMRILpopulationstoidentifyQTLforresistancetoPythium.
4. PreliminaryexperimentssuggestcoldtolerancethatoccurssoonafterplantingincreasesthesusceptibilityofsoybeantoinfectionbyPythiumspecies.Researchisunderwaytoexaminetimingandlengthofcoldstress,effectofgerminationgrowthstageofsoybean
andeffectofseedtreatmentsonsusceptibilitytoPythiuminfection.5. Over50isolatesofP.sojaeweresequenced.Wearecurrentlyassemblingdataandwill
comparediversityamongstAvrlocitoimproveourunderstandingoftheevolutionofthispathogeninthepresenceofresistance(Rpsgenesandpartialresistance)insoybean.
6. Datafromtheseresearchweresharedinthreeonlinepaneldiscussions,andatfivefielddays/farmermeetings(~600participants).
7. CharacterizedthephenotypicvariationwithinF.oxysporumfromsoybean.FoundthatF.isolatesvaryinaggressivenessonsoybeanandthatthereisanisolatebysoybeangenotypeinteraction.
8. IdentifiedsoybeangenotypeswithdifferentlevelsofresistancetoF.oxysporum9. DeterminedtheeffectoftemperatureandpHonaggressivenessofF.oxysporum
isolates
PUBLICATIONS
BooksandRefereedPublications
1. Zhang,J,Singh,Ar.,Mueller,D.andSingh,As.2015.Genome-wideassociationandepistasisstudiesunravelthegeneticarchitectureofsuddendeathsyndromeresistanceinsoybean.ThePlantJournal.84:1124–1136.doi:10.1111/tpj.13069
2. KandelY.R.,Haudenshield,J.S.,SrourA.Y.,Fakhoury,A.M.,ChilversM.I.,WangJ.,Santos,P.,HartmanG.L.,Malvick,D.K.,Floyd,C.M.,Mueller,D.S.andLeandro,L.F.S.2015.Multi-labcomparisonofsixquantitativePCRassaysfordetectionandquantificationofFusariumvirguliformefromsoybeanrootsandsoil.Phytopathology.105:1601-1611.
3. Olson,T.R.,Gebreil,A.,Micijevic,A.,Bradley,C.A.,Wise,K.A.,Mueller,D.S.,Chilvers,M.I.,andMathew,F.M.2015.AssociationofDiaporthelongicollawithblackzonelinesonmaturesoybeanplants.PlantHealthProgressdoi:10.1094/PHP-RS-15-0020
4. Kandel,Y.,Bradley,C.A.,Wise,K.A.,Chilvers,M.,Tenuta,A.,Davis,V.M.,Esker,P.E.,Smith,D.L.,Licht,M.A.,andMueller,D.S.2015.Effectofglyphosateapplicationonsuddendeathsyndromeofsoybeanunderdifferentfieldconditions.PlantDisease.99:347-354.
5. Kanobe,C.,M.T.McCarville,M.E.O’Neal,G.L.Tylka,andG.C.MacIntosh.2015.Soybeanaphidinfestationinduceschangesinfattyacidmetabolisminsoybean.PLoSONE10(12):e0145660.doi:10.1371/journal.pone.0145660.
6. Kurle,J.,Dorrance,A.E.,Robertson,A.E.,Bradley,C.,Giesler,L.andWise,K.PathotypediversityofPhytophthorasojaeintenstatesintheUnitedStates.PlantDisease(inpress).
7. Matthiesen,R.,Abeysekara,N.,Maroof,S.andRobertsonA.E.CombiningisolatestoscreenfornovelsourcesofresistancetoPhytophthorasojaeinsoybean.PlantDis.(inpress)
8. Matthiesen,R.,Ahmad,A.andRobertson,A.E.2016.TemperatureaffectsvirulenceandfungicidesensitivityoffourspeciesofPythiumoncornandsoybean.PlantDis.(inpress)AvailableonlineasPlantDisease“FirstLook”:http://dx.doi.org/10.1094/PDIS-04-15-0487-RE
9. Stewart,S.,Robertson,A.E.Wickramasinghe,D,Michel,A.andDorranceA.E.2016.PopulationstructureamongandwithinIowa,Missouri,OhioandSouthDakotapopulationsofPhytophthorasojae.PlantDis.100:367-379
10. Hartman,G.L.,Leandro,L.F.S.andJ.C.Rupe.2015.SuddenDeathSyndrome.Pages:in:CompendiumofSoybeanDiseasesandPests,Hartmanetal.eds.,5thEd.APSpress,St.Paul,MN.
11. Hartman,G.L.,Chang,H.-X.,andL.F.S.Leandro.2015.ResearchAdvancesandManagementofSoybeanSuddenDeathSyndrome.CropProtection73:60-66
Abstracts
1. Phillips,X.A.andMueller,D.S.2015.Greenstemdisorderandtheeffectoffungicideapplicationandstress.NorthCentralAmericanPhytopathologicalSociety.Lansing,MI.
2. Silva,G.A.,Leandro,L.,Mueller,D.2015.Rootrot-likesymptomscausedbygrain-basedinoculumsubstrates.AmericanPhytopathologicalSocietyAnnualMeeting,Pasedena,CA.
3. Kandel,Y.R.,Wise,K.A.,Bradley,C.A.,Tenuta,A.U.,Leandro,L.F.S.,Mueller,D.S.2015.Influenceofplantingdate,seedtreatmentandcultivaronplantstand,suddendeathsyndrome,andyieldofsoybean.AmericanPhytopathologicalSocietyAnnualMeeting,Pasedena,CA.
4. KobayashiLeonel,R.,Leandro,L.F.,andMueller,D.2015.EvaluationofcovercropsusceptibilitytoFusariumvirguliforme,thecausalagentofsuddendeathsyndromeofsoybeanAmericanPhytopathologicalSocietyAnnualMeeting,Pasedena,CA.
5. Groves,C.,German,T.,Dasgupta,R.Mueller,D.andSmithD.2015.Issoybeanveinnecrosisvirus(SVNV)seedtransmitted?XthInternationalSymposiumonThysanopteraandTospoviruses.PacificGrove,CA.
6. Acharya,K.,E.Byamukama,andG.L.Tylka.2015.DeterminingHeteroderaglycinesHGtypestoimprovesoybeancystnematodemanagementinSouthDakota.Proceedingsofthe2015AnnualMeetingoftheAmericanPhytopathologicalSociety,August1-6,2015.
7. Beeman,A.andG.L.Tylka.2015.EffectsofILeVOandVOTiVOseedtreatmentsonhatching,motilityandrootpenetrationofthesoybeancystnematode.Proceedingsofthe2015AnnualMeetingoftheAmericanPhytopathologicalSociety,August1-6,2015.
8. Clifton,E.H.,E.W.Hodgson,G.L.Tylka,andA.J.Gassmann.2015.Proceedingsofthe2015NorthCentralBranchMeetingoftheEntomologicalSocietyofAmerica.
9. Tylka,G.,C.C.Marett,A.E.Robertson,M.Serrano,andT.A.Mueller.2015.EffectsofClarivaseedtreatmentonsoybeancystnematode(Heteroderaglycines)populationdensitiesandsoybeanyieldsinIowain2014.Proceedingsofthe2015AnnualMeetingoftheAmericanPhytopathologicalSociety,August1-6,2015.
10. Lerch,E.R.,Dorrance,A.E.andRobertson,A.E.2015.ScreeningtheNAMparentsforresistancetomultiplePythiumspecies.Phytopathology105(Suppl.4)S4:81
11. Matthiesen,R.,Morgan,M.,Fakhoury,A.andRobertson,A.E.2015.AntagonisticactivityofpotentialbiocontrolagentsscreenedagainstPythiumspp.thatcauseseedlingdisease.Phytopathology105(Suppl.4)S4:90.
12. Matthiesen,R.,Chilvers,M.andRobertson,A.E.2015.PathogenicityofPythiumspeciesfromtheNorthcentralregiononsoybeanandcornscreenedattwotemperatures.Phytopathology105(Suppl.4)S4:90
13. Rojas,A.,Jacobs,J.L.,Bradley,C.A.,Malvick,D.M.,Nelson,B.D.,Robertson,A.E.,Tenuta,A.U.,Wise,K.A.,Giesler,L.,Jardine,D.,Rupe,J.andChilvers,M.2015.Oomycetecommunitydiversity;Thesoybeanrootrotcomplex.Phytopathology105(Suppl.4)S4:92
14. Serrano,M.andRobertson,A.E.2015.Chiilinginjuryduringimbibitionofsoybeanseedincreasesincidenceofdamping-offcausedbyP.torulosum.Phytopathology105(Suppl.4)S4:125.
15. Abdelsamad,N.,MacIntosh,G.,andL.F.S.Leandro.2015.Ethyleneelicitssoybeandefenseresponsesandreducessymptomsofsuddendeathsyndrome.Phytopathology105:S4.1.
16. Cruz,D.R.,Leandro,L.F.S.,andG.P.Munkvold.2015.EffectsoftemperatureandpHonFusariumoxysporumandsoybeanseedlingdisease.Phytopathology105:S4.31
Extensionpublications1. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Smith,D.,andTenuta,
A.2015.SoybeanDiseaseManagement:StemCanker.CropProtectionNetwork.CPN10062. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,
Noveroske,A.,Sisson,A.,Smith,D.,Tenuta,A.,andYoung-Kelly,H.2015.SoybeanDiseaseManagement:ScoutingforSoybeanSeedlingDiseasesandDisorders.CropProtectionNetwork.CPN1009.
3. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,Smith,D.andTenuta,A.2015.SoybeanDiseaseManagement:ScoutingforSoybeanStemDiseases.CropProtectionNetwork.CPN1002.
4. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,Noveroske,A.,Sisson,A.,Smith,D.,Tenuta,A.,andYoung-Kelley,H.2015.SoybeanDiseaseManagement:SoybeanSeedlingDiseases.CropProtectionNetwork.CPN1008
5. Tenuta,A.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,andWise,K.2015.SoybeanDiseaseManagement:ScoutingforCommonSoybeanSeedDiseases.CropProtectionNetwork.CPN1001.
6. Smith,D.,Chilvers,M.,Dorrance,A.,Hughes,T.,Mueller,D.,Niblack,T.,andWise,K.2015.SoybeanDiseaseManagement:CharcoalRot.CropProtectionNetwork.CPN1004
7. Tylka,G.L.andM.P.Mullaney.2015.Soybeancystnematode-resistantsoybeansforIowa.IowaStateUniversityExtensionPublicationPM1649,28pp.
8. Tylka,G.L.,G.D.Gebhart,C.C.Marett,andM.P.Mullaney.2015.EvaluationofsoybeanvarietiesresistanttosoybeancystnematodeinIowa–2015.IowaStateUniversityExtension,publicationIPM52,32pp.
9. Kandell,Y.,Robertson,A.,Zaworski,E.,Chilvers,M.,Dorrance,A.EandBestor,N.2015.PhytophthoraRootRotofSoybean.CPN10-14.IowaStateUniversityExtensionandOutreach.
Kansas
DougJardine,ExtensionPlantPathologist,KansasStateUniversity
KansasStateUniversitypersonnelinvolvedwithsoybeandiseaseactivities:ChrisLittle(SoybeanPathology-Research),TimTodd(Nematology),HaroldTrick(PlantBiotechnology),BillSchapaugh(SoybeanBreeding)
Kansassoybeanproductionfor2015totaled148.6millionbushels,up4percentfrom2014.Yield,at38.5bushelsperacrewasup2.5bushelsfromayearearlier.Areaforharvest,at3.86millionacres,wasdown3percentfrom2014.ThereductioninplantedacreswastheresultofconsistentrainsinMayandJunethatcausedsomefarmerstoabandonplantingintentions.Diseaselossestimatesforthestatewere3.6percent,whichwasthelowestsinceestimateswerebegunin1995.TimelyrainsinAugustreducedcharcoalrottoanegligiblelevelof0.1percent,wellbelowtheannualaverageof5.5percent.Lossesfromseedlingblight(2%)andSCN(1.0%)madeupthebulkofthestate’sdiseaselosses.
ImpactStatements
1. "Metagenomics"and"metabarcoding"analysisofthesoybeanseedmicrobiomehasrevealedamorecompletecatalogoforganismsinseedsamplesandspecificseedtissuesthantheculture-basedapproachesofthepast.Analysisofseedtissues(coat,cotyledons,embryoaxis)showedthatdifferentspeciescolonizetheseseedtissuesatsignificantlydifferentlevels.
2. IthasbeendiscoveredthatF.proliferatumcausesseedlingdiseaseundermoreacidic(pH5.5)andwarmertemperatures(30ºC)thantheaverageformanyotherFusariumspp.Also,increasedsoilphosphoruscontent,siltytextures,andsoybeanrotationsaftersorghumtendtofavorhigherF.proliferatumpopulations.ManyoftheisolatesofF.proliferatumtestedhavesomedegreeoffludioxonilresistancealso.
3. Ithasbeendemonstratedthatearlyplantingdates(e.g.5Mayto19May)resultsinthehighestSDSseverity,buttheyieldbumpfromearlierplantingappearstomitigatediseaseimpacts.
4. UsingcomparativegenomicsofMacrophominaphaseolina isolates fromdifferenthostspecies (including soybean), it has been demonstrated that there are differences inunique proteins among isolates, genome size variability, and differential genomeidentitiescomparedtothesequencedM.phaseolinareferencegenome.
Publications
1. Adee, E., Ruiz Diaz, D.A., and Little, C.R. 2016. Effect of soil test and phosphorusfertilization on soybean sudden death syndrome severity. Crop, Forage, & TurfgrassManagement2:Inpress.
2. Pedrozo, R., Fenoglio, J.J., and Little, C.R. 2015. First report of seedborne Fusariumfujikuroi causing seed rot and seedling blight on soybean (Glycinemax) in theUnitedStates.PlantDisease99:1865.
3. Jardine,D.J.,E.Adee,andG.Sassenrath.2015.EffectsofseedprotectionchemicalsonstandandyieldofsoybeansinKansas,2014.PlantDis.Mgmt.Reports.9:ST001
4. Ciampitti, I., RuizDiaz,D., Jardine,D., Peterson,D.,Whitworth, R.J., andD.H. Rogers.2015.KansasSoybeanManagement2014.K-StateResearchandExtensionPublicationMF3154(Revised)January2015
5. DamonSmith;AdamSisson,AlbertTenuta,AnneDorrance,CarlBradley,DarenMueller,DeanMalvick,DougJardine,EmmanuelByamukama,KierstenWise,LauraSweets,LorenGiesler, Marty Chilvers, Sam Markell, Teresa Hughes, Terry Niblack. 2015. SoybeanDiseaseManagement:CharcoalRot,CropProtectionNetwork1004
PresentationsandAbstracts
1.Radwan,O.,Little,C.R,andHartman,G."Wholegenomesequencingandcomparativegenomics of five isolates ofMacrophomina phaseolina isolated from agronomic andprairieplantspecies."(PlantandAnimalGenomeXXIV,SanDiego,California;January9-13,2016)
2.Little,C.R.,Adee,E.,andPresley,D."Influencesofplantingdate,ILeVOseedtreatment,rootstructure,andsoilcompactionuponSDSinKansas."(KansasSoybeanCommission,Topeka,Kansas;December16,2015)
3.Little,C.R."Fusariumexperiments inKansas." (USB/NCSRPSoybeanSeedlingDiseasesMeeting,St.Louis,MO;November4,2015)
4.Little,C.R."GermplasmscreeningandseedtreatmentefficacyagainstFusariumprolifer-atum." (USB/NCSRP Soybean Seedling DiseasesMeeting, St. Louis,MO; November 4,2015)
5. Pedrozo,R.,andLittle,C.R.2015.TheinterestingcaseofsoybeanseedborneFusariumspp.:fromidentitytopathogenicity.Phytopathology105:S4.109.
6. Rojas,A.,Jacobs,J.L.,Bradley,C.A.,Malvick,D.M.,Nelson,B.D.,Robertson,A.,Tenuta,A.U., Wise, K.A., Giesler, L., Jardine, D., Rupe, J. and M. Chilvers. 2015. Oomycete
communitydiversity,Thesoybeanrootrotcomplex.APSAnnualMeeting,Pasadena,CA,Abstract42-S
Louisiana
TreyPrice,Extension/ResearchPlantPathologist/LSUAgCenter
LSUAgCenterpersonnelinvolvedinsoybeandiseaseextensionandresearch:TreyPrice,MyraPurvis,HunterPruitt,ClaytonHollier,PatriciaBollich,RaySchneider,ClarkRobertson,RonnieLevy,BlairBuckley,CharlieOverstreet
Frogeyeleafspot(FLS)wasthemostprevalentfoliardiseasein2015withCercosporaleafblight(CLB)followingclosebehind.Wehavefungicideresistanceissueswithbothofthesepathogenpopulations,whichleavesuswithlimitedmanagementoptions,particularlyforCLB.Forthisreason,soybeanfoliardiseasemanagementwithfungicidesshouldbeapproachedreactivelyinsteadofproactively.Surprisingly,in2015acoupleoffungicidetreatmentshadsignificantefficacyonCLB.Wewilllookcloselyatthesecompoundsnextyeartoconfirmconsistency.Fortunately,triazolefungicidesremaineffectiveonFLS,andthereareresistantvarietiesavailabletomanagethisdisease.WecontinuedtosearchforvarietiesresistanttoCLB,andweresuccessfulinidentifyingahandfulthatshowedpromisein2015.Varietyselectionisthebestwaytoproactivelymanagefoliardiseasesinsoybean.HopefullywewillbeabletotestthesevarietiesinmorelocationsincooperationwithDr.BlairBuckleyandothersthroughoutthemid-southtospeed-upthebreedingprocess.
Taprootdecline(TRD)continuedtobethepredominantsoilborneissueinLouisianain2015.Anecdotalinformationindicatesreducedincidenceandseveritywithrotationand/ortillage.Seedtreatmentefficacyforthisdiseaseisunknown.WewillcontinuetoworkcloselywithproducerstodetermineyieldlossesassociatedwithTRD.
Othernoteworthyissuesinthestatein2015included:aerialblight,anthracnose,brownspot,rootknotnematode,soybeanrust,stemcanker,suddendeathsyndrome,andtargetspot.
Throughoutthe2015growingseason,werespondedtoapproximately300phonecallsandtextmessages,manyofwhichresultedinfieldvisits,laboratorydiagnostics,orcollaborativeopportunities.Weparticipatedin13growermeetingsand9fielddaysthroughouttheyeartoextendresultsofourresearcheffortstostakeholders.
Publications
Albu,S.,Price,P.,Doyle,V.,Schneider,R.W.2015.MolecularcharacterizationoftheG143AmutationleadingtoQoIfungicideresistanceamongfungalpathogenscausingCercosporaleafblightandpurpleseedstainonsoybean.Proc.SouthernSoybeanDiseaseWorkers.17.
Gauthier,N.A.,Schneider,R.W.,Chanda,A.,Silva,E.C.,Price,P.,andCai,G.Cercosporaleafblightandpurpleseedstain.In:CompendiumofSoybeanDiseasesandPests,FifthEdition.APSPress,St.Paul,MN.38-41.
Price,P.2015.Frogeyeleafspotprevalentagainin2015.LouisianaCropsNewsletter.5,7:1-5.
Price,P.,Hollier,C.,andLevy,R.2015.2015Soybeanre-capanddiseaseupdate.LouisianaCropsNewsletter.5,9:5-8.
Price,P.2015.FungicideresistanceintheCercosporaleafblightandpurpleseedstainpathogenofsoybean.PlantManagementNetworkWebcastontheSoybeanFungicideResistanceHub.
Price,P.,Padgett,G.B.,andM.A.Purvis.2015.TheeffectofselectedfungicidesonfrogeyeleafspotinLouisiana,2014.PlantDis.Manag.Rep.9:FC037.
Price,P.2015.Diseaseconcernsinmid-southsoybeanproduction.Proc.NationalConservationSystemsCotton&RiceConference.53-54.
Price,P.,Purvis,M.A.,Cai,G.,Padgett,G.B.,Robertson,C.L.,Schneider,R.W.,andAlbu,S.2015.FungicideresistanceinCercosporakikuchii,asoybeanpathogen.PlantDis.99:1596-1603.
Price,P.,Purvis,M.A.,Pruitt,H.,Hollier,C.,Schneider,R.W.,Groth,D.,andPadgett,G.B.2015.PrevalenceoffungicideresistanceinLouisianasoybeanandrice.PhytopathologySuppl.2.105:S2.9.
Singh,R.,Price,P.,Padgett,G.B.,andBurks,T.2015.FirstreportofsuddendeathsyndromeofsoybeancausedbyFusariumvirguliformeinLouisiana.PlantHealthProgress.doi:10.1094/PHP-BR-15-0031.
Minnesota
DeanMalvick,ExtensionPlantPathologist,UniversityofMinnesota
UniversityofMinnesotapersonnelinvolvedinsoybeandiseaseextensionandresearch:Dr.SenyuChen,Dr.JamesKurle,andDr.DeanMalvick.Dept.ofPlantPathology;andDr.AaronLorenzOrf.Dept.ofAgronomyandPlantGenetics(breeding)
In2015,7.6millionacresofsoybeanwereharvestedinMinnesotaovertheproductionareathatextendsfromtheIowatoManitobaborders.Averagestateyieldwas~50bu/acre,whichisabout8bu/acremorethanin2014.Diseaseandcropchallengesvariedoverthislargearea.Inmostareasitwasagoodyearforsoybeanproductionwithadequaterainfall,generallymoderatetolowtemperatures,andminimalperiodswithenvironmentalcropstress.Whitemoldwasthemostwidespreadandtalked-aboutsoybeandiseaseinMNthisyear.WetweatherduringfloweringperiodsinJulyalongwithrelativelycooltemperaturesinmanyareaswerefavorable,especiallyinwetareasofsouthernMNvs.thedrierareasinthenorthwest.FrequentrainsinsouthernMNalsofavoredsuddendeathsyndrome(SDS,however,delayeddevelopmentofthediseaseinAugustreduceditsimpactonyieldlossinmanyareas.Weatherconditionswerealsofavorablefordevelopmentofbrownstemrot(BSR)inpartsofMN.Othersoybeandiseasesalsooccurredatnotablelevelsinsomefields,includingpodandstemblightinwesternMNanddownymildewinNorthwesternMN.OneofthemostcommonsoybeandiseasesinthepasttwoyearsinMinnesotawasRhizoctoniarootrot,butthiswasaminorproblemin2015.
ImpactStatements
1. ThePythiumspeciesthatinfectsoybeanrootsinMinnesotasoybeanfieldsareverydiverse.Theycandifferentiallydecreasesoybeanandcornrootgrowthoverarangeofcoolandwarmtemperatures,anddifferentfungicidesareinconsistentinreducingtheirgrowth.
2. Ourstudiesindicatethatsignificantinteractionscanoccurbetweenseveralsoilbornefungalpathogensofsoybean,whichmayhavestrongimplicationsfordiseasemanagementandresearchonkeydiseases.
3. AssociationmappingandgenomicpredictionhasidentifiednovellociforresistancetosuddendeathsyndromeandwasshowntobeusefulforimprovementofgeneticresistancetoSDSinearlymaturingsoybeangermplasm.
4. Publications
Peer-reviewedResearchArticles
1. Kandel,Y.,Haudenshield,J.,Srour,A.Y.,Islam,K.T.,Fakhoury,A.M.,Santos,P.,Wang,J.,Chilvers,M.I.,Hartman,G.,Malvick,D.K.,Floyd,C.M.,Mueller.D.,andLeandro.L.
2015.Multi-laboratorycomparisonofquantitativePCRassaysfordetectionandquantificationofFusariumvirguliformefromsoybeanrootsandsoil.Phytopathology,105:1601-1611.
2. Bajaj,R.,Hu,W.,Huang,Y.,Chen,S.,Prasad,R.,Varma,A.,&Bushley,K.E.(2015).ThebeneficialrootendophytePiriformosporaindicareduceseggdensityofthesoybeancystnematode.BiologicalControl,90,193–199.
3. Bao,Y.,Kurle,J.E.,Anderson,G.,&Young,N.D.(2015).Associationmappingandgenomicpredictionforresistancetosuddendeathsyndromeinearlymaturingsoybeangermplasm.MolecularBreeding,35(6),1–14.
AbstractsandPosters1. Srour,A.Y.,Leonardo,L.,Malvick,D.,andFakhoury,A.2015.Unravelingthemicrobial
profileoftherhizosphereofSDS-suppressivesoilsinsoybeanfields.PresentedattheNationalMeetingoftheAmericanPhytopathologicalSocietyMeetinginPasadena,CA.
2. Floyd,C.M.andMalvick,D.K.2015.InteractionsbetweenFusariumvirguliformeandothercommonfungalpathogensinsoybeanrootrotcomplexes.PresentedattheNationalMeetingoftheAmericanPhytopathologicalSocietyMeetinginPasadena,CA.
3. L.Radmer,G.Anderson,D.K.Malvick,andJ.E.Kurle.2015.PythiumspeciesfromMinnesotasoybeanfields,theirrelativepathogenicitytosoybeansandcorn,andtheirsensitivitytoseedtreatmentfungicides.PresentedattheNationalMeetingoftheAmericanPhytopathologicalSocietyMeetinginPasadena,CA.
4. Floyd,C.M.andMalvick,D.K.2015.InteractionsbetweenCadophoragregata(brownstemrot)andFusariumspp.insoybeanplants.PresentedattheNorthCentralDivisionAPSMeetinginLansing,MI.
5. ROJAS,A.,Jacobs,J.L.,Bradley,C.A.,Malvick,D.K.,Nelson,B.D.Robertson,Tenuta,A.U.,Wise,K.A.,Giesler,L.,Jardine,D.,Rupe,J.,andChilvers,M.I.2015.Oomycetecommunitydiversity:Thesoybeanrootrotcomplex.PresentedattheNationalMeetingoftheAmericanPhytopathologicalSocietyMeetinginPasadena,CA.
BookChapter
1. D.K.Malvick,C.R.Grau,andL.E.Gray.2015.Brownstemrot,pp.64-67,In:CompendiumofSoybeanDiseases,5thEdition.G.Hartman,J.Rupe,L.Domier,E.Sikora,K.Steffey,andJ.Davis,eds.APSPress.St.Paul.201pp.
Missouri
LauraSweets,ExtensionPlantPathologist,UniversityofMissouri
Areaplantedtosoybean,at4.55millionacres,wasdown19percentfrom2014.Theharvestedarea,at4.48millionacres,wasdown20percentfromlastyear.Thesoybeanyieldwasestimatedat40.5bushelsperacre,down6bushelsfrom2014.Productionisestimatedat181millionbushels,down30percentfromthepreviousyear.
The2015seasonwasanextremelychallengingoneforsoybeanproducersinMissouri.Althoughtheyearstartedoutonthedrysidethatchangedrapidly.Bymid-Aprilwetconditionshaddelayedcornplantingbyalmost50percentofthefive-yearaverage.Soybeanplantingdidn’treallygetunderwayuntilmid-May,slightlybehindthefive-yearaverage.ByJune1soybeanplantinghadprogressedto23percentcomplete,comparedto74percentforthepreviousyearand57percentforthefive-yearaverage.ThistrendcontinuedandbyJuly6soybeanplantinghadprogressedto73percentcomplete,comparedto94percentforthepreviousyearand97percentforthefive-yearaverage.Theprimaryreasonforthismajordecreaseinsoybeanacreswaspreventedplantingduetoextendedcool,wetconditions.Approximately1.3millionacresintendedforsoybeanswerenotplantedduetounfavorableenvironmentalconditions.
The2015seasonwasanextremelychallengingoneforsoybeanproducersinMissouri.Thewetconditionsledtopoorstandswithsaturatedsoils,oxygendeprivationandPythiumdiseasescontributingtoseeddecay,damping-offandseedlingmortality.SampleswithPhytophthora,FusariumandRhizoctoniarootrotswerealsoreceivedinthePlantDiagnosticLaboratory.
Inspiteofthewetconditions,foliagediseaseswereneitherwidespreadnorsevere.Septoriabrownspotwasunusuallylowinbothincidenceandseverity.Frogeyeleafspotwasalsoquitelowinincidenceandseverity.DownymildewcameinquitelateintheseasonbutduringSeptemberwasveryprevalentintheuppercanopyofmanyfields.SoybeanrustwasnotconfirmedinMissouriduringthe2015season.Soybeanveinnecrosisviruswasnotfounduntillateintheseasonandtheninextremelylowlevels.
Suddendeathsyndromehadbeenamajorissuethroughoutthestateduringthe2014season.SDSdiddevelopin2015butnotnearlytotheextentofthepreviousyear.Itcameinlateenoughintheseasontheyieldlossesinmostfieldswerelow.
Soybeancystnematodecontinuestobeamajorprobleminsoybeanproductionthroughoutthestate.GrowersseemtobelievethatresistantvarietieshavecontrolledSCN.AlthoughtherehavebeendocumentedcasesparticularlyinthesouthwestregionofthestateofSCNpopulationsachievinghighreproductionratesonPI-88788varieties.
Publications
ExtensionManuals:
Bradley,Kevin,LauraE.Sweets,WayneC.Bailey,andMoneenJonesandJamesW.Heiser.2015.2015Missouripestmanagementguide:corn,grainsorghum,soybean,winterwheat,riceandcotton.UniversityofMissouriExtensionpublicationM171.241pp.
2015NewsletterArticles:AllarticlespublishedintheUniversityofMissouri’sIntegratedPestandCropManagementNewsletter,V.25.Similarcontributionsmadeinpreviousyears.
Sweets,L.E.Earlyseasonsoybeandiseases-May
Sweets,L.E.SDSandotherlateseasonsoybeandiseases-September
NorthDakota
SamMarkell,ExtensionPlantPathologist,NorthDakotaStateUniversity
ThegeographicalexpansionofsoybeancystnematodecontinuestooccurinNorthDakota.Egglevelonfirstdetectionarecommonlyhigh(inexcessof10,000eggs/100cc).Themajorityofvarietiesavailableinmaturitygroupslessthan0.6aresusceptible,placinggrowersinaprecariouspositioniftheyarenotmanagingSCN.Exacerbatingtheproblem0.75Mto1.0Macresofdryediblebeansaregrownintheregions.
Rootsrotsremainasignificantprobleminthestate.Whitemoldwaslowinfrequencyandseverityin2015.EconomiclosstofoliardiseasesisveryrareinNorthDakota.However,significantamounts(prevalenceinfieldsandhighseverityinsomefields)ofdownymildewwasobservedinfieldsacrossthenorthernthirdofthestate.Itisunclearifyieldlossduetodiseasepressureoccurred,but,Iestimatethatatleast10,000-20,000acresweresprayedwithfungicidesinanefforttomanagethedisease.TheprimarychemicalusedwasAproach(DuPont).
SoybeanproductioninNorthDakotacontinuestoincreaseinacreageandexpandintonewareas.In2015,NASSrankedND4thinoverallacreagewith5.4MA,withanaverageyieldofapproximately32bu/A.
ResearchPublications:
Mathew,F.,M.,Castelbury,L.,A.,Jordahl,J.G.,Taylor,C.,A.,Meyer,S.,M.,Lamppa,R.S.,Pasche,J.,A.,andMarkell,S.,G.2015.IdentificationofDiaporthelongicollaondryediblepeas,dryediblebeansandsoybeansinNorthDakota.PlantHealthProgressdoi:10.1094/PHP-RV-14-0045.
Abstracts/Proceedings:
Markell,S.,Jordahl,J.,Meyer,S.,Glogoza,P.andKnudson,M.2015.IncreasinggrowerawarenessandmonitoringspreadofHeteroderaglycinesinNorthDakota,USA.XVIIIInternationalPlantProtectionCongress.Berlin,Germany.August24-27th,2015(Talk).
Yan,G.P.,Markell,S.,Nelson,B.J.,Helms,T.C.,andOsorno,J.M.2015.ThestatusofsoybeancystnematodeoccurrenceandmanagementinNorthDakota.Pages126-127inAbstractsof54thAnnualMeetingoftheSocietyofNematologists,EastLansing,MI,July19-24.(Poster).
TradeMagazineArticles:
Markell,S.2015.SCNsamplingprogramQandA.NorthDakotaSoybeanGrowerMagazine.Vol.4(4):29.
Nelson,B.,Yan,G.,Markell,S.,andPasche,J.2015.Sampleyoursoilforsoybeancystnematode!Northarvestbeangrowermagazine.Vol.21(3):28-29.
Pasche,J.,andMarkell,S.2015.Dryediblebeandiseaseresearch.Northarvestbeangrowermagazine.Vol.21(2):37-39.
Markell.S.2015.IncreasingawarenessofsoybeancystnematodeinNorthDakota.NorthDakotaSoybeanCouncil2015ResearchUpdate.P28.
Podcast:
‘Soybeancystnematode’radiopodcast.RecordedonAugust17th,2015anddistributedtotheNorthDakotaSoybeanCouncillistserveonAugust18th,2015.
ExtensionPresentations:
12/2/15 BroadleafCropsDiseaseControlUpdate
Fargo,ND NDSU/UMCommercialpesticideApplicatorTraining
250
12/2/15 SeedTreatmentUpdate(withAndrewFriskop)
Fargo,ND NDSU/UMCommercialpesticideApplicatorTraining
250
12/1/15 Soybeancystnematode–Aspreadingproblem
Fargo,ND NorthernAgExpo 70
10/9/15 Plantpathologyprimer Fargo,ND+videolocations
MasterGardenercourse
105
9/11/15 Managingsoybeancystnematodewithseedtreatments
Hankinson,ND
RichlandCountysoybeancystnematodefieldday
25
9/11/15 Theimportanceandbiologyofsoybeancystnematode
Hankinson,ND
RichlandCountysoybeancystnematodefieldday
25
9/9/15 Managingsoybeancystnematodewithseedtreatments
Galesburg,ND
TraillCountysoybeancystnematodefieldday
20
9/9/15 Theimportanceandbiologyofsoybeancystnematode
Galesburg,ND
TraillCountysoybeancystnematodefieldday
20
9/8/15 Soybeandiseases Lisbon,ND RansomCountysoybeanvarietyplottour
25
9/4/15 Managingsoybeancystnematodewithseedtreatments
Absaraka,ND
CassCountysoybeancystnematodefieldday
40
9/4/15 Theimportanceandbiologyofsoybeancystnematode
Absaraka,ND
CassCountysoybeancystnematodefieldday
40
9/3/15 Soybeandiseases:Trailertwo Carrington,ND
CarringtonResearchExtensionCenterannualrowcroptour
20
9/3/15 Soybeandiseases:Trailerone Carrington,ND
CarringtonResearchExtensionCenterannualrowcroptour
50
9/2/15 Soybeandiseases Mooreton,ND
RichlandCountyVarietyPlotTour
35
7/17/15 PlantpathologyinNorthDakota–researchanddiseasefocusinSEND.
Fargo,ND NorthDakotaStateCollegeofScienceFieldDay
30
7/17/15 PlantpathologyinNorthDakota–ResearchanddiseasefocusoncentralNDcrops.
Fargo,ND BismarckStateUniversityFieldDay
30
3/4/15 Handson:Soybeandiseases Mandan,ND
WesternCropScoutSchool
125
2/25/15 Handson:Soybeandiseases Fargo,ND EasternCropScoutSchool
103
2/24/15 Theimportanceofpestmanagement
Fargo,ND EasternCropScoutSchool
103
2/19/15 Understandingandmanagingrootrots
GrandForks,ND
InternationalCropExpo
75
2/5/15 SCN:whereitisandhowwemanageit
GrandForks,ND
BestoftheBest 325
2/4/15 SCN:sourcesofresistanceandnematicides
Moorhead,MN
BestoftheBest 196
1/30/15 Diseasemanagementinsoybeans
PortagelaPrairie,MB
GettingitRight 200
1/15/15 Soybeandiseases:emphasisnewgrowers
Newburg,ND
GettingitRight 50
1/15/15 Soybeandiseases:emphasisonNWcroprotation
Minot,ND GettingitRight 80
1/14/15 Soybeandisease:emphasisondrybeanrotations
Underwood,ND
GettingitRight 50
1/13/15 Soybeandiseases:emphasisonSCN
Streeter,ND
GettingitRight 28
1/9/15 Broadleafplantdiseases Fargo,ND CCATrainingPrep 25
Ohio
AnneE.Dorrance,ProfessorandResearch-ExtensionPlantPathologist,TheOhioStateUniversity
TheOhioStateUniversitypersonnelinvolvedinsoybeandiseaseextensionandresearch:
DorranceLab:CliftonMartin(ResearchAssociate,nowwithOSUEMuskinghamCounty),DamithaWickramasinghe(ResearchAssociate,nowwithBayerCropSciences),DelorisVeney(ResearchAssistant),LindaWeber(ResearchAssistant),JonellWinger(ResearchAssistant),AnnaStasko(GraduateResearchAssociate),JaquelineHuzarNovakowski(GraduateResearchAssociate),MeredithEyre(GraduateResearchAssociate),CassidyGedling(GraduateResearchAssociate),KelseyScott(GraduateResearchAssociate),AmilcarLoyoVargas(GraduateResearchAssociate);
JohnSchoenhals,ElizabethRoche,BrianKleinke(MastersinPlantHealthManagementProgram)
Dr.FengQu,AssociateProfessor
Dr.ChrisTaylor,AssociateProfessor
Dr.TerryNiblack,Professor
Niblacklab:HoracioNicoraLopez(GraduateResearchAssociate,co-adviseDorrance)
MajorDiseases.Diseaseconditionsduring2015:Thefieldseasonwasagainabitchallenging,especiallyduringplanting.HeavyrainsintheendofJune(>18”)insomefieldsprovidedperfectenvironmentalconditionsforsoybeanseedlingblight.Coolweatherandrainsduringfloweringalsoappearedforwhitemoldinsoybeanthisyear,howeverdroughtconditionsduringJulydrasticallylimiteddiseasedevelopmentexceptinafewfields.TherewerealsoreportsandlossesduetoPhytophthorastemandrootrotandfrogeyeleafspot.Suddendeathsyndromewasatverylowlevelsinfieldswithalonghistoryofthisdisease.
Therewere4,750,000and4,740,000plantedandharvested,respectivelytosoybeaninOhioduring2015,whichisdownfromthepreviousyear,butstillamongthehighest.Moreimportantly,astatewideyieldaverageof50bu/AasofMarch26,2016fromtheNationalAgriculturalStatisticsService.
ImpactStatements
1. Fromseedlingswithsymptomsofdamping-offthatwererecoveredfromaffectedfields,recoveredanumberofPythiumspp.thatweremetalaxylinsensitive.
2. Scoutedfieldsandmaderecommendationstosprayfungicidestomanagefrogeyeleafspotandwhitemoldonsusceptiblevarietiesinfieldswithalonghistoryofbothdiseases.
3. EvaluatedalargenumberofseedtreatmentcompoundsforefficacytowardsPhytophthorasojaeandPythiumspp.Continuedtoexpandlistofavailableproductswithgoodefficacytowardsthesepathogens.
4. IdentifiednovelmajorQTLforF.graminearuminplantintroductionsalongwithmarkerstouseinintrogressingthistraitintohighyieldingvarieties.
5. Completedseveralcollaborativestudieswhichlookedattheendosymbiontthatresidesinsoybeanaphid,rootarchitectureinapopulationthatisalsosegregatingforresistancetoP.sojaeandhighdensitymolecularmapinoneofoursoybeanpopulations.
6. Identified,again,thatfungicidesonlyprovideyieldbenefitswhendiseaseispresent(Bluckstudy)
Publications
Cassone,B.J.,Redinbaugh,M.,Dorrance,A.E.,andMichel,A.2015.ShiftsinBuchneraaphidicoladensityinsoybeanaphids(Aphisglycines)feedingonvirus-infectedsoybean.InsectMolecBiol.24:422-431.
Bluck,G.M.,Lindsey,L.E.,Dorrance,A.E.,Metzger,J.D.2015.SoybeanyieldresponsetoRhizobiainoculant,gypsum,manganesefertilizer,insecticide,andfungicide.Agron.J.107:1757-1765.
Acharya,B.,Lee,S.,RoufMian,M.A.,Jun,T.,McHale,L.K.,Michel,A.P.,andDorrance,A.E.2015.Identificationandmappingofquantitativetraitloci(QTL)conferringresistancetoFusariumgraminearumfromsoybeanPI567301B.Theor.Appl.Genet.128:827-838.
Prince,S.J.,Song,L.,Qiu,D.,MaldonadodosSantos,J.V.,Chai,C.,Joshi,T.,Patil,G.,Valliyodan,B.,Vuong,T.D.,Murphy,M.,Krampis,K.,Tucker,D.M.,Biyashev,R.,Dorrance,A.E.,SaghaiMaroof,M.A.,Xu,D.,Shannon,J.G.,andNguyen,H.T.2015.Geneticvariantsinrootarchitecture-relatedgenesinaGlycinesojaaccession,apotentialresourcetoimprovecultivatedsoybean.BMCGenomics16:132.doi:10.1186/s12864-015-1334-6
LeeS,FreewaltKR,McHaleLK,SongQ,JunT-H,MichelAP,DorranceAE,MianMAR.2015.Ahigh-resolutiongeneticlinkagemapofsoybeanbasedon357recombinantinbredlinesgenotypedwithBARCSoySNP6K.MolBreeding35:58
SouthDakotaFebinaMathew,OilseedPlantPathologist,SouthDakotaStateUniversity
SouthDakotaStateUniversitypersonnelinvolvedinsoybeandiseaseextensionandresearch:FebinaMathew,EmmanuelByamukama,ConnieStrunk,andConnieTande.
InSouthDakotatotalof5.15Millionacresofsoybeanwereplantedin2015with5.12millionacresharvested(USDA-NASS2016).Soybeanproductionreachedanaverageyieldof46bushelsperharvestedacrein2015,comparedto45bushelsperharvestedacrein2014.
Mostsoybeanacreswereplantedbymid-to-lateMayinSouthDakotain2015.However,mostareasofthestatereceivedrainfallsinlateMayandearlyJune,resultinginplantingdelays.Somestrong storms earlier this summer brought wind and hail damage to soybean fields innortheasternSouthDakota.WeatherbecamehotanddryinJuly,thenturnedcoolandwetinAugustandSeptember.TheseweatherconditionsledtomoderatelevelsofbacterialdiseasesandSeptoriabrownspotthroughouttheseason.Whitemold,Suddendeathsyndrome,Brownstemrot,Phytophthora,andStemcankerwasscatteredacrossthestateandimpactedasmallportionoftheacreageinSouthDakota.Soybeancystnematodewasconfirmedingreaterthan85%ofthesoybeanproductionarea(~29counties)asof2015.
ImpactStatements
1. Soybeandiseaseupdateswereprovidedtoproducers,cropconsultantsandotherstakeholdersthroughoutthe2015soybeangrowingseason.
2. Soybeancystnematodemanagementinformationwasdisseminatedtoproducersandcropconsultants.ThishasledtoanincreaseinSCNtestsamplesubmission.
3. Fungicideefficacytrialsbothforseedandfoliartreatmentswereconductedin2015andsummariesfromthesetrialshavepresentedatgrowermeetings.
4. ResearchPublications,ExtensionArticles,andVideos
RefereedJournals1. Olson,T.R.,Gebreil,A.,Micijevic,A.,Bradley,C.A.,Wise,K.A.,Mueller,D.S.,Chilvers,
M.I.,andMathew,F.M.2015.AssociationofDiaporthelongicollawithblackzonelinesonmaturesoybeanplants.PlantHealthProgressdoi:10.1094/PHP-RS-15-0020.
2. Mathew,F.M.,Tande,C.,Gebreil,A.,Byamukama,E.,Osborne,L.,andDraper,M.2015.FirstreportofBrownstemrotofsoybean(GlycinemaxL.)causedbyPhialophoragregatainSouthDakota.PlantDisease99:8.
Abstracts1. Okello, P., Gebreil, A., Olson, T., Kontz, B., Micijevic, A., and Mathew, F. 2015.
PathogenicityofDiaporthespeciesinfectingsoybeans(GlycinemaxL.)inSouthDakota.Phytopathology105:S4.103.
2. Posch, J., Varenhorst, A., and Mathew, F. 2015. Interaction between soybean cystnematode and stem canker pathogens. 11th Annual Ag Outlook conference andtradeshow, South Dakota Soybean Association, Sioux Falls, SD. December 10, 2015(Poster).
3. Okello, P., Singh, A., and Mathew, F. 2015. Evaluation of soybean germplasm forresistancetoFusariumproliferatum.11thAnnualAgOutlookconferenceandtradeshow,SouthDakotaSoybeanAssociation,SiouxFalls,SD.December10,2015(Poster).
4. Chowdhury,R.,Byamukama,E.,andMathew,F.2015.Phytophthorasojaepathotypesoccurring in SouthDakota.11thAnnualAgOutlook conferenceand tradeshow, SouthDakotaSoybeanAssociation,SiouxFalls,SD.December10,2015(Poster).
5. Hernandez-Perez,O.,andByamukama,E.2015.TillageeffectonpopulationdensitiesofHeteroderaglycinesintheUnitedStates:Areview.CSSA/SSA/ASAAnnualMeeting,MinneapolisMN.
6. Acharya,K.,Byamukama,E.andTylka,G.DeterminationofHeteroderaglycinestypesforimprovedsoybeancystnematodemanagementinSouthDakota.APSMeeting,Pasadena,CA.
7. AcharyaK.,Byamukama,E.andTylka,G.2015.GreenhouseassessmentofcommercialsoybeancultivarforresistanceagainstPopularH.glycinespopulationsofSouthDakota.AgOutlookConference,SiouxFalls,SD.
ProceedingsofConferences
1. Mathew,F.,Okello,P.,Gebreil,A.,andDeneke,D.2015. Surveyof fungaldiseases incommercial soybean fields in South Dakota. Proceedings of the 8th InternationalIntegrated Pest Management Symposium. Salt Lake City, UT. March 23-26th, 2015(Poster).
2. Gebreil,A.,Micijevic,A.,Weber,A.,andMathew,F.2015.CharacterizationofDiaporthespecies infectingsoybeans (Glycinemax L.) inSouthDakota. Proceedingsof the100thAnniversaryMeetingofSouthDakotaAcademyofScience,Oacoma,SD(Inpress).
Extension/Outreachpublications1. Mathew, F. 2015. Sudden death syndrome appearing in South Dakota soybeans. The
SoybeanLeaderMagazine.January/February2015.2. Tenuta,A.,Bradley,C.,Chilvers,M.,Geisler,L.,Mathew,F.,Mueller,D.,Smith,D.,and
Wise,K.2015.Scoutingforcommonsoybeanseeddiseases.CropManagementNetworkCPN-1001.
3. Wise, K., Bradley, C., Chilvers,M., Geisler, L.,Mathew, F.,Mueller, D., Smith, D., andTenuta,A.2015.Scoutingforsoybeanstemdiseases.CropManagementNetworkCPN-1002.
4. Wise, K., Bradley, C., Chilvers,M., Geisler, L.,Mathew, F.,Mueller, D., Smith, D., andTenuta,A.2015.Stemcanker.CropManagementNetworkCPN-1006.
5. Mueller,D.,Bradley,C.,Chilvers,M.,Geisler,L.,Mathew,F.,Smith,D.,Tenuta,A.,andWise, K. 2015. Pod and stem blight and Phomopsis seed decay. Crop ManagementNetworkCPN-1007.
6. JohnsonO.P.,Deneke,D.L.,Rosenberg,M.,Vos,D.,Alms,J.,Wrage,L.J.,Szczepaniec,A.,Bachman,Byamukama,E.,andRuden,K.2015.2015SouthDakotaPestManagementGuide-Soybeans.SDSUExtensionService-iGrow.83p.
7. Strunk,C.andByamukama,E.2015.Beonthelookoutforseedlingdiseases.Published5/22/2015.http://igrow.org/agronomy/corn/be-on-the-lookout-for-seedling-diseases
8. Byamukama,E.,Tande,C.,Okello,P.,andMathew,F.2015.Rootrotsdevelopinginsomecornfields.Publishedon6/25/2015.Onlinehttp://igrow.org/agronomy/corn/root-rots-developing-in-some-corn-fields/
9. Strunk,C.andByamukama,E.2015.DifferentiatingbetweenPhytophthorarootrotandstemrot.Published8/6/2015.Onlinehttp://igrow.org/agronomy/soybeans/differentiating-between-phytophthora-root-stem-rot-and-stem-canker/
10. Byamukama,E.andStrunk,C.2015.Soybeandiseasesupdate.Published7/23/2015.Onlinehttp://igrow.org/agronomy/soybeans/soybean-diseases-update/
11. Byamukama,E.andAcharya,K.2015.Assesssoybeansforthesoybeancystnematode.Published7/23/2015.http://igrow.org/agronomy/corn/assess-soybeans-for-the-soybean-cyst-nematode/
12. Byamukama,E.2015.Brownstemrotshowingupinsomesoybeanfields.Published9/10/2015.http://igrow.org/agronomy/soybeans/brown-stem-rot-showing-up-in-some-soybean-fields/
13. Byamukama,E.andStrunk,C.2015.Cornandsoybeandiseaseupdate:stemrotsandGoss’swiltincreasing.Published9/3/2015.http://igrow.org/agronomy/soybeans/corn-soybean-disease-update-stem-rots-and-gosss-wilt-increasing/
Tennessee
HeatherM.Kelly,Extension/ResearchPlantPathologist,UniversityofTennessee
UniversityofTennesseepersonnelinvolvedinsoybeandiseaseextensionandresearch:HeatherM.Kelly,ScottD.Stewart,AngelaMcClure,JamieJordan,WesleyCrowder,RyanBlair,andoveradozencountyagents
USDA-ARSpersonnelinvolved(collaborations):PrakashArelli,AlemuMengistu,JasonDeffenbaugh,ChrisStreet,andBarbaraMichaud
InTennesseeatotalof1.75millionacresofsoybeanswereplantedin2015with1.72millionacresharvested.Atotalof79.12millionbushelsproducedwithanaverageof46bu/a.Harvestedacreageandproductionwasup110,000acresand5.06millionbushelsfrom2014,respectively.Statewideaverageyieldwasthesamein2014.
DuetoawetspringsomefullseasonplantingsweredelayedorreplantedinMayandJune,closertothesameplantingtimeassoybeanplantedafterwheatinthestate.Somefieldsthatdidgetplantedontimehadslightlyreducedstandsduetoseedlingdiseases.Ingeneral,weatherconditionsthroughouttheseasonwereconduciveforgoodyieldsandfoliardiseasedevelopmentinsoybean.Dependentuponcultivarplanted,therewerelowtoseverelevelsoffrogeyeleafspotandseptoriabrownspotthroughouttheseason.Verylittlesuddendeathsyndromeandsouthernstemcankerwasreportedinthestate.Soybeancystnematodecontinuedtobeconfirmedthroughoutthestatethroughsamplessubmitted.Lateseasondiseasesthathadminimalimpactonyieldincludedanthracnose,cercosporaleafblight/purpleseedstain,anddiaporthe/phomopsisseedrotcomplex.
ImpactStatements
1. OrganizedandevaluatedsoybeansentinelplotstomonitorandtestCercosporasojina(frogeyeleafspot)diseaseandQoIfungicideresistantlevelsacrossthestate
2. Evaluatedover70commercialvarietiesinsevere,moderate,andlowdiseasepressurelocationsforfoliardiseasesandresponsetofungicide
3. Conductedfungicideefficacytrialsonfrogeyeleafspotusedtoupdatethesoybeanfungicidetablecuratedbythisgroup
4. Participatedinmulti-statetrialsonfrogeyeleafspotandcercosporaleafblightevaluatingfungicideproductsandapplicationtimings
5. Continuedresearchtrialsinvestigatinginfluenceofdifferentsourcesofinoculumandtillageonfrogeyeleafspotdevelopment
6. ConductedgreenhousecompetitionstudiesbetweenQoIfungicideresistantandsensitiveCercosporasojina(frogeyeleafspot)
7. HeldhandsontrainingfordiseaseidentificationandshowcasedfungicideefficacytrialsatSoybeanDiseaseFielddayattheResearchandEducationCenterinMilan
ResearchPublications,ExtensionArticles,andVideos
RefereedJournals1. Kelly,H.M.,Dufault,N.S.,Walker,D.R.,Isard,S.A.,Schneider,R.W.,Giesler,L.J.,
Wright,D.W.,Marois,J.J.,andHartman,G.L.2015.Fromselectagenttoanestablishedpathogen:theresponsetoPhakopsorapachyrhizi(SoybeanRust)inNorthAmerica.Phytopathology105:905-916.(invitedarticle)
2. Mengistu,A.,Kelly,H.M.,Arelli,P.R.,andBellaloui,N.2015.Effectsoftillage,cultivarandfungicideonPhomopsislongicollaandCercosporakukuchiiinsoybean.CropProtection72:175-181.
3. Kelly,H.M.,Wright,D.L.,Dufault,N.S.,Marois,J.J.2015.Decisionmodelsforfungicideapplicationsforsoybeanrust.PlantHealthProgress16(2).1May2015.doi:10.1094/PHP-RS-14-0050
BookChapter
1. Young-Kelly,H.andDufault,N.S.2015.SoybeanDiseasesinNorthAmericaChapterInDoençasdaSoja-MelhoramentoGenéticoeTécnicasdeManejo(DiseasesofSoybean-GeneticImprovementandManagementTechniques).(edsE.Lemes,L.Castro,andR.Assis)ISBN-978-85-7625-329-7
PlantDiseaseManagementReports
1. Jordan,W.J.andKelly,H.M.2015.FieldevaluationofmaturitygroupVsoybeancultivarstofrogeyeleafspotandfungicideinTennessee,2014.PlantDiseaseManagementReport.Volume9,FieldCropsSection.
2. Jordan,W.J.andKelly,H.M.2015.FieldevaluationoflatematuritygroupIVsoybeancultivarstofrogeyeleafspotandfungicideinTennessee,2014.PlantDiseaseManagementReport.Volume9,FieldCropsSection.
3. Jordan,W.J.andKelly,H.M.2015.FieldevaluationofearlymaturitygroupIVsoybeancultivarstofrogeyeleafspotandfungicideinTennessee,2014.PlantDiseaseManagementReport.Volume9,FieldCropsSection.
4. Cochran,A.M.andKelly,H.M.2015.FieldevaluationoffungicideefficacyonfrogeyeleafspotusingsingleandcombinationFRACcodefungicides,2014.PlantDiseaseManagementReport.Volume9,FieldCropsSection.
5. Butler,S.A.andKelly,H.M.2015.Fieldevaluationoftheinfluenceofdropletsizeandsprayangleonfungicideefficacyinsoybean,2014.PlantDiseaseManagementReport.
Volume9,FieldCropsSection.6. Butler,S.A.andKelly,H.M.2015.Fieldevaluationoftheinfluenceofsprayvolumeand
dropletsizeonfungicideefficacyinsoybean,2014.PlantDiseaseManagementReport.Volume9,FieldCropsSection.
ProceedingsatConferences
1. Kelly,H.M.andVega,B.2015.PhenotypicandgenotypiccharacterizationofQoIfungicideresistantCercosporasojina.Phytopathology(Nov.issue).AnnualAmericanPhytopathologicalSocietyMeeting,Pasadena,CAAug.2015.
2. Butler,S.A.Young-Kelly,H.,andKruger,G.2015.InfluenceofapplicationtechnologyonfoliarfungicideefficacyonCercosporasojinainfectedsoybean.Phytopathology(Nov.issue).AnnualAmericanPhytopathologicalSocietyMeeting,Pasadena,CAAug.2015.
3. Cochran,A.M.,Jordan,J.,Bradley,C.A.,K.Lamour,andKelly,H.M.2015.Frogeyeleafspotresponsetosoloandcombinationfungicides.Phytopathology(Nov.issue).AnnualAmericanPhytopathologicalSocietyMeeting,Pasadena,CAAug.2015.
4. Kelly,H.M.andNewman,M.N.2015.Influenceofcultivar,fungicide,andweatheronfrogeyeleafspotdiseaseandyieldinsoybean.InternationalIntegratedPestManagementSymposium,SaltLakeCity,UTMarch2015.
5. Kelly,H.M.2015.QoIFungicideresistanceCercosporasojinaupdateforMid-Southregion.NCERA200/208/137SoybeanVirus,Rust,andDiseasesJointMeeting,Washington,D.C.April2015
6. Kelly,H.M.andVega,B.2015.ChallengesandopportunitiesintheuseofmoleculartoolstodetectStrobilurin/QoIfungicideresistance:thecaseoffrogeyeleafspot.SouthernSoybeanDiseaseWorkers(SSDW)Meeting,Pensacola,FLMarch2015
7. Butler,S.A.Young-Kelly,H.,andKruger,G.2015.InfluenceofapplicationtechnologyonfoliarfungicideefficacyinCercosporasojinainfectedsoybeans.Phytopathology105(Suppl.2):S2.2.SouthernDivisionofAmericanPhytopathologicalSocietyMeeting,Atlanta,GAFeb.2015.
8. Cochran,A.M.,Jordan,J.,Bradley,C.A.,K.Lamour,andKelly,H.M.2015.Frogeyeleafspotresponsetosoloandcombinationfungicides.Phytopathology105(Suppl.2):S2.3.SouthernDivisionofAmericanPhytopathologicalSocietyMeeting,Atlanta,GAFeb.2015.
Extension/Outreachpresentations
1. DuPontCropConsultantsmeeting-ManagementofFLSinsoybean2/26/20152. MissouriScoutSchool–Plantpathologyintro,diseasemanagementinwheat,corn,
soybean,andcotton2/10/20153. ObionFarmSchool–Soybeanandwheatdiseaseupdate2/9/20154. WestTNGrainConference–Inputvaluesforsoybeandiseasemanagement2/5/2015
5. EastTNGrainConference–soybeanandwheatdiseaseupdate1/22/20156. KY/TNGrainConference-FungicideandDiseaseUpdateonCornandSoybean
1/20/20157. SoybeanDiseaseManagementUpdateat9countyproductionmeetings
Extension/Outreacharticlesandotheractivities
1. News.UTcrops.com(newsletter/blog)-Soybeandiseasesandfungicideconsiderations7/21/2015,andSoybeanDiseaseUpdate8/30/2015(578pageviewsasofOctober11,2015)
2. Kelly,H.2015.W343SoybeanFungicideEfficacyTable.UTExtensionSoybeandiseasemanagementinformation.
3. Allen,F.L.,V.R.Sykes,R.Blair,M.A.McClure,H.M.Kelly.2015.SoybeanVarietyPerformanceTestsinTennessee,2015.Contributeddiseaseratingssection.
4. Contributedtoarticleandvideoon‘2015weathernotasfavorableforSDS,butit’sstillaround’:http://deltafarmpress.com/soybeans/2015-weather-not-favorable-sds-it-s-still-around
VirginiaHillary Mehl, Extension Plant Pathologist, Virginia Tech
Virginia Tech personnel involved in soybean disease extension and research: Hillary Mehl, Tian Zhou, David Holshouser, Linda-Byrd Masters, Steve Byrum, Ed Hobbs, Kelsey Vasser
Soybean was harvested on 620,000 acres and yields in Virginia averaged 34.5 bu/A, or 7.5 bu/A below the record high for soybean in 2012. Nematodes including soybean cyst, southern root-knot, sting, stubby root, and stunt nematodes contributed to yield loss. Frogeye leaf spot and Cercospora blight were the most prevalent foliar diseases and may have caused yield losses where outbreaks occurred during seed development and up to full pod (R6). However, overall levels of foliar disease in the Virginia soybean crop were low in 2015 due to dry conditions during July and August. However, seed rot and other seedborne diseases resulted in significant quality losses due to heavy rains following maturity of the soybean crop. Severe outbreaks of stem canker occurred in certain fields where susceptible varieties were planted. Charcoal rot was also confirmed throughout the state in fields where drought stress occurred. Impact Statements
1. Conducted small plot research on foliar diseases and nematodes impacting soybean in Virginia. 2. Initiated a survey for QoI resistant Cercospora sojina in the mid-Atlantic region (NC/VA/DE). 3. Conducted on-farm trials to validate a weather-based decision aid for soybean foliar fungicide
applications. 4. Disseminated soybean disease management data to growers through local meetings and through
Extension publications and websites.
Research Publications, Extension Articles, and Videos
Abstracts
1. Mehl, H. L., Zhou, T. and Holshouser, D. 2015. Development and optimization of a weather-based decision aid for soybean foliar fungicide applications in Virginia. American Phytopathological Society Annual Meeting, Pasadena, CA.
2. Zhou, T., Holshouser, D., Phipps, P. M. and Mehl, H. L. 2015. Validation and optimization of a weather-based soybean foliar fungicide application advisory for soybean in Virginia. APS Potomac Division Meeting, Rehoboth Beach, DE.
Published Reports
1. Zhou, T., Byrd-Masters, L., and Mehl, H. L. 2016. Evaluation of foliar fungicide for control of common foliar diseases in soybean, 2015. Plant Disease Management Reports 10:FC136.
2. Zhou, T., Byrd-Masters, L., and Mehl, H. L. 2016. Evaluation of application timings of foliar fungicide for control of common fungal diseases in soybean, 2015. Plant Disease Management Reports 10:FC137.
Extension/Outreach publications/blogs/web articles
5. Mehl,H.L.,Kleczewski,N.andJohnson,C.S.2016.DiseaseandNematodeManagementinFieldCrops.InPestManagementGuide:FieldCrops,2016.D.A.Herbert,Coordinator.VirginiaTechandVirginiaCooperativeExtension.Publication456-016(ENTO-70P).
6. Mehl, H. L. 2016. Applied Research on Field Crop Disease Control 2015. Virginia Tech and Virginia Cooperative Extension.
7. Mehl. H. L. 2015. Soybean disease updated – frogeye leaf spot. Virginia Ag Pest and Crop Advisory Blog (http://blogs.ext.vt.edu/ag-pest-advisory/) – August 21.
8. Mehl, H. L. 2015. Foliar fungicide applications in soybean. Virginia Ag Pest and Crop Advisory Blog (http://blogs.ext.vt.edu/ag-pest-advisory/) – August 20.
WisconsinDamonSmith,ExtensionPlantPathologist,UniversityofWisconsin-MadisonUniversityofWisconsin-Madisonpersonnelinvolvedinsoybeandiseaseextensionandresearch:ShawnConley,CarolGroves,ScottChapman,JohnGaska,BrianHudelson,AnnMacGuidwin,QuinnWatson,ChrisBloomingdale,JaimeWilbur,MeganMccaghey
WisconsinDepartmentofAgriculture,TradeandConsumerProtectionpersonnelinvolvedinsoybeandiseaseresearch:AnettePhibbsandAdrianBarta
Wisconsinsaw1.9millionacresofsoybeansplantedin2015,whichwasanall-timerecord.However,thestateisranked#16inthecountryforsoybeanproduction.Thesoybeancropwasestablishedontimeandtheseasonwasveryconduciveforsoybeangrowthandproduction.Recordyieldsof50bu/awere6bu/ahigherthan2014andjustshyoftheall-timerecordof50.5bu/a.
Diseasecontinuetobeasignificantyield-reducerinWisconsin.Betterthan92%oftheacreageisinfestedwithSCN.ThestateplantpathologylabwillstopsamplingforSCNaswemoveforwardin2016.In2015,stemdiseasewereofsignificantconcern.Whitemoldhascontinuedtobethenumber1stemdiseaseinthestateandwasfoundthroughoutmuchofthesoybeanproductionarea.Inadditiontowhitemold,stemcankerandpodandstemblighthaveincreased.Thesediseasescausedlotsofconfusionforgrowersbecausemanyfieldssufferedfromthesediseasesandwhitemold.OtherdiseaseincludedbrownstemrotandPhyllostictaleafspot.Virusissueswerefairlyminimal,however,12%offieldsampledtestedpositiveforAflalfamosaicvirusandSoybeandwarfvirus,While6%testedpositiveforSoybeanveinnecrosisvirus.ImpactStatements
1. Workedasacollaboratorinthemultistategroup,CropProtectionNetwork,togenerateasuiteofsoybeandiseaseidentificationandmanagementpublications
2. Developedapilotwhitemoldfungicidedecisiontoolbasedonapredictionmodelforapothecialdevelopment.Thistoolwillbepilotedinthefieldin2016.
3. Soybeangermplasmlinewithahighlevelofwhitemoldresistancehavebeendevelopedandfield-tested.Thelinesarebeingusedforfurtherbreedingofelite,commercialcultivars.
ResearchPublications,ExtensionArticles,andVideos
RefereedJournals1. Piotrowski,J.,Okada,H.,Lu,F.,Li,S.,Ranjan,A.,Smith,D.,Higbee,A.,Ulbrich,A.Coon,
J.,Deshpande,R.,Bukhman,Y.,McIIwain,S.,Ong,I.,Myers,C.Boone,C.,Landick,R.,Ralph,J.,Kabbage,M.,Ohaya,Y.2015.Theplantderived,antifungalagentpoacicacid
targetsβ-1,3-glucan.PNASwww.pnas.org/cgi/doi/10.1073/pnas.1410400112.
2. KandelY.R.,Bradley,C.A.,Wise,K.A.,Chilvers,M.I.,Tenuta,A.U.,Davis,V.M.,Esker,P.D.,SmithD.L.,LichtM.A.andMueller,D.S.2015.Effectofglyphosateapplicationonsuddendeathsyndromeofglyphosate-resistantsoybeanunderdifferentfieldconditions.PlantDis.99:347-354.
Abstracts1. Bloomingdale,C.,Groves,R.L.,andSmith,D.L.2015.Seasonaloccurrenceofthrips
speciesprevalentinsoybeanandtheeconomicimpactofSoybeanveinnecrosisvirusinWisconsin.Phytopathology105:S4.16.
2. Ranjan,A.,Smith,D.L.,andKabbage,M.2015.Soybeanrespiratoryburstoxidasehomologsarerequiredforwhitemolddiseasedevelopment.Phytopathology105:S4.116.
3. Willbur,J.F.,Lucas,H.,Kabbage,M.,andSmith,D.L.2015.DevelopmentofapredictivemodelforSclerotiniasclerotiorumapothecialdevelopmenttocontrolwhitemoldinsoybeanfields.Phytopathology105:S4.148.
Videos
1. Soybeanveinnecrosisvirus.2015.Invitedwebinarrecording.PestManagementNetwork,FocusonSoybeanserieshttp://www.plantmanagementnetwork.org/edcenter/seminars/soybean/SoybeanVeinNecrosisVirus/.
Extension/Outreachpublications
1. Watson,Q.andSmith,D.L.2015.FactSheet:XGT1018–Sclerotiniastemrotofsoybean.UWExtension-CooperativeExtensionService.UniversityofWisconsin.
2. Davis,V.,Jensen,B.,Nice,G.,Renz,M.,andSmith,D.L.2015.A3646–PestManagementinWisconsinFieldCrops.UWExtension-CooperativeExtensionService.UniversityofWisconsin.
3. Tenuta,A.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,Smith,D.L.,andWise,K.2015.FactSheet:CPN1001A–Scoutingforcommonsoybeanseeddiseases:Scoutingcard.CropProtectionNetwork.
4. Tenuta,A.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,Smith,D.L.,andWise,K.2015.FactSheet:CPN1001B–Scoutingforcommonsoybeanseeddiseases:Full-lengthpublication.CropProtectionNetwork.
5. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,Smith,D.L.,andTenuta,A.2015.FactSheet:CPN1002A–Scoutingforsoybeanstemdiseases:Scoutingcard.CropProtectionNetwork.
6. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Sisson,A.,Smith,D.L.,andTenuta,A.2015.FactSheet:CPN1002B–Scoutingforsoybeanstemdiseases:Full-lengthpublication.CropProtectionNetwork.
7. Bloomingdale,C.,Bradley,C.,Chilvers,M.,Giesler,L.,Groves,R.,Mueller,D.,Smith,D.L.,Tenuta,A.,andWise,K.2015.FactSheet:CPN1003–Soybeanveinnecrosisvirus.CropProtectionNetwork.
8. Smith,D.L.,Chilvers,M.,Dorrance,A.,Hughes,T.,Mueller,D.,Niblack,T.,andWise,K.2015.FactSheet:CPN1004–Charcoalrot.CropProtectionNetwork.
9. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Mueller,D.,Smith,D.L.,andTenuta,A.2015.FactSheet:CPN1006–Stemcanker.CropProtectionNetwork.
10. Mueller,D.,Bradley,C.,Chilvers,M.,Giesler,L.,Mathew,F.,Smith,D.L.,Tenuta,A.,andWise,K.2015.FactSheet:CPN1007–PodandstemblightandPhomopsisseeddecay.CropProtectionNetwork.
11. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,Noveroske,A.,Sisson,A.,Smith,D.L.,Tenuta,A.,andYoung-Kelly,H.2015.FactSheet:CPN1008–Soybeanseedlingdiseases.CropProtectionNetwork.
12. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,Noveroske,A.,Sisson,A.,Smith,D.L.,Tenuta,A.,andYoung-Kelly,H.2015.FactSheet:CPN1009A–Scoutingforsoybeanseedlingdiseasesanddisorders:Scoutingcard.CropProtectionNetwork.
13. Wise,K.,Bradley,C.,Chilvers,M.,Giesler,L.,Johnson,B.,Legleiter,T.,Licht,M.,Mueller,D.,Noveroske,A.,Sisson,A.,Smith,D.L.,Tenuta,A.,andYoung-Kelly,H.2015.FactSheet:CPN1009B–Scoutingforsoybeanseedlingdiseasesanddisorders:Full-lengthpublication.CropProtectionNetwork.
14. Mueller,D.,Bradley,C.,Chilvers,M.,Giesler,L.,Sisson,A.,Smith,D.L.,Tenuta,A.,andWise,K.2015.CPN1010A–Scoutingforwhitemoldinsoybean:Scoutingcard.CropProtectionNetwork.
15. Mueller,D.,Bradley,C.,Chilvers,M.,Giesler,L.,Sisson,A.,Smith,D.L.,Tenuta,A.,andWise,K.2015.CPN1010B–Scoutingforwhitemoldinsoybean:Full-lengthpublication.CropProtectionNetwork.
16. Smith,D.L.2015.Fungicideefficacytablesupdatedfor2015.WisconsinFieldCropsPathologyBlog/WisconsinCropManager–April15.
17. Smith,D.L.2015.Timetoconsideryourwhitemoldin-seasonmanagementplan.WisconsinFieldCropsPathologyBlog/WisconsinCropManager–June24.
18. Smith,D.L.2015.Mid-seasonsoybeanissuesinWisconsin.WisconsinFieldCropsPathologyBlog/WisconsinCropManager–July29.
19. Smith,D.L.2015.Whatshouldyouknowaboutcornandsoybeandiseasesasyouprepareforharvest?WisconsinFieldCropsPathologyBlog/WisconsinCropManager–September16.
20. Smith,D.L.2015.2015Wisconsinfieldcropspathologyfungicidetestssummarynowavailable.WisconsinFieldCropsPathologyBlog/WisconsinCropManager–December15,http://fyi.uwex.edu/fieldcroppathology/files/2015/12/2015-Fungicide-Test-Summary.V2.pdf.
21. WisconsinBestManagementPracticesGuideforSoybean.2015.EditedbyConley,S.P.,andSmith,D.L.PublishedbytheUnitedSoybeanBoard.
22. Marburger,D.,Conley,S.,Gaska,J.,Gerber,L.,MacGuidwin,A.,andSmith,D.L.2015.TheRelationshipbetweentheCausalAgentofSDSandSCNinWisconsin.SoySentinel.Vol.12.No.2.
