WEEK 3: JULY 17-24 IN THIS ISSUE...• Delay in fruit/flower production • A transmission of...
Transcript of WEEK 3: JULY 17-24 IN THIS ISSUE...• Delay in fruit/flower production • A transmission of...
IN THIS ISSUE: LaceBugs:Pages2-4
VerticilliumWiltofTreesandShrubs:Pages4-6HydrangeaAnthracnose:Pages7-8
TEST YOUR MASTER GARDENER SKILLS (Answeronpage8)
IdentifythesewhitespotsonaMustardGreenLeaf!
WEEK 3: JULY 17-24
IMAGE FROM HELPDESK
PleasereferonlytothecurrentVCEPest
ManagementGuide:HomeGroundsandAnimalsforpesticiderecommendations.All
pesticidesrecommendedareattheriskofthe
user.Readandfollowalllabelinstructionsforuse,storage,anddisposal.
Remember,thepesticidelabelisthelaw.
LACE BUGS
IMAGE FROM UNIVERSITY OF
FLORIDA AZALEALACEBUG
Symptoms:• Yellowspotsonupperleaf
surfacesthatseemtolooklikemitedamagebutwithbiggerspots
• Severefeedingresultsingrayishblotchesorcompletelybrownleaves
• Brownvarnishtypedroppingsontheleaf’sunderside
IMAGE FROM RUTGERS UNIVERSITY OAKLACEBUGEGGS
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IMAGE FROM UNIVERSITY OF CALIFORNIA,
IRVINE SYCAMORELACEBUG
IMAGE FROM UNIVERSITY OF FLORIDA AZALEALACEBUGDAMAGE
LACE BUGS (CONT.)
Relevance:EggshatchinMayand1-2generationsoccurbythesummer’send
Knowingtheplantspecieswillhelpyouidentifythelacebugspecies.Belowisalistofcommonlacebugandtheirrespectivehostplants.ThoseboldedaretheonesmostprevalentinVirginia.
AndromedaLaceBug JapaneseAndromedaAzaleaLaceBug Azaleaandmountainlaurel
RhododendronLaceBug RhododendronandmountainlaurelAlderLaceBug Alder,hazel,elm,birch,andcrabapple
BrasswoodLaceBug BrasswoodandlindenBirchLaceBug Yellowbirch,whitebirch,beech,willow,mountainash,mapleandeastern
hophornbeamBuckeyelacebug BuckeyeElmlacebug Americanelm
Hackberrylacebug HackberryHawthornlacebug Hawthorn,quince,pyrancantha,cotoneaster,andserviceberry
Oaklacebug OakSycamorelacebug SycamoreandLondonplanetreeWalnutlacebug Blackwalnut,butternut,andlinden
Willowandpoplarlacebug Willow,balsampopular,bigtoothaspen,andquakingaspenWillowlacebug Willow
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Description:adultsare1/8”to1/4”inchlongwithanetlikepatternonthewings.Inaddition,theirwingsaredottedwithbrownandblack.Lacebugeggs
areelongatedandcylindricalshapes.
DamagetoPlants:Lacebugfeedingisdirectlyharmfultoplants
MoreResourcesforLaceBugControl
VCEPestManagementGuide:HomeGroundsandAnimalsVCEExtension:LaceBugsUMDExtension:LaceBugs
PennStateExtension:LaceBugsonBroad-LeavedEvergreenOrnamentalPlantsPennStateExtension:LaceBugonDeciduousWoodyOrnamentalPlants
VERTICELLIUM WILT OF TREES AND SHRUBS Relevance:SymptomsofdiseasearemoreapttoappearinJulyandAugust
Why:Causedbysoil-bornefungi,Verticilliumalbo-atrumandVerticilliumdahliae.Thefungusiscommoninmanysoilsbutpreferscertainhoststhatincludetrees,shrubsandevenvegetablesespeciallythetomatoplant.BelowisatableofcommontreesandshrubssusceptibletoVerticilliumWilt.
Ash Maple Honeysuckle RussianOlive SmoketreeAzalea Elm Linden Plum SpireaJapaneseBarberry
Dogwood BlackLocust Redbud Sumac
Catalpa Elder Magnolia Rose ViburnumCherry,otherstonefruits
CurrantandGooseberry
KentuckyCoffeeTree
Oak,pineandred(rare)
Weigela
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BestControlMethods:• Monitorplantsregularlyinspringforlacebugsigns
• PlantAzaleaandRhododendroninashadyareatoavoidheavylacebugpopulations
DamagetoPlants:Seriousdiseasesincethefungispreadsinternallyorsystematicallywithintheplantandcanleadtoplantdeath
Symptoms
• Small,yellowfoliage• Leafscorch(marginalbrowning)• Slowgrowth• Abnormallyheavyseedcrops• Oftenonebranch/side/sectionis
affected• Someexhibitelongate,dead
areasofbarkondiseasedbranches/trunks
• Diebackofshootsandbranches• Leafcurling,drying• Abnormalredoryellowcolorof
leavesorinareasbetweenleafveins,partialdefoliation,wiltingandbranchdieback
• Inwiltingbranches,therearediscoloredstreaksinbark
a) Greentoblackinmaplesb) Browninelmsc) Browntoblackinblacklocust
andothertrees
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IMAGEFROMPURDUEUNIVERSITYVERTICELLIUMONMAPLE
IMAGEFROMUMASSAMHERSTVERTICELLIUMONGREENASH
BestControlMethods• Donotreplantsusceptiblespecieswhereaspecimenwaskilledby
VerticilliumWilt• Pruneoutaffectedlimbs;waterandfertilizetomaintaintreevigor• NeverusewoodchipstakenfromaVerticilliuminfectedtreeasmulchor
pottingmedium• Topreventspread,disinfecttools
MoreResourcesforVerticilliumWiltControl
UniversityofMinnesotaExtension:VerticilliumwiltoftreesandshrubsPennStateExtension:VerticilliumWiltofWoodyOrnamentals
MissouriBotanicalGarden:VerticilliumWilt
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IMAGE FROM MICHIGAN STATE
UNIVERSITY VerticilliumonNorway
maplewithgreendiscoloration
HYDRANGEA ANTHRACNOSE
• Circularorirregularlyshapedbrownspots
• Spotsturnfromlightbrowntotan
• Spotshaveabull’seyeappearance
• Spotsbecomeangularoncetheyhavereachedlargeleafveins
Relevance:Hydrangeaanthracnosefavorshotandwetconditions.
Why:CausedbythefungusCollectotricbumgloeosporioides,whichcanattackboththeleavesandbloomsofthehydrangea.Heavilyfertilizedhydrangeas
maybemostsusceptibletoattackbyC.gloeosporioides.
Symptoms:
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IMAGES FROM THE MASTER GARDERNER COORDINATOR ANTHRACNOSEONHYDRANGEAS
TEST YOUR MASTER GARDENER SKILLS
Answer:ThewhitespotsareAphideggsandlarvae!
Aphidsaresoft-bodiedinsectsthataremainlygreenorblack.However,therearehundredsofspeciesandthese“plantlice”canalsobelavender,gray,brown,pink,redoryellow.Acommoncharacteristicbetweenallspeciesisthepresenceoftwotubes,calledcornicles,onthebackendsoftheirbodies.Aphidsfeedinclustersandgenerallyprefertofeedonnew,succulentshootsorleaves.Lightinfestationsareusuallyharmlesstotheplantsbutheavyinfestationscanresultin:
• Leafcurl• Wilting• Stuntingofshootgrowth• Delayinfruit/flowerproduction
• Atransmissionofpathogenstoplants
• Honeydew(aphidexcrement)buildupwhichcanleadtosootymold
BestControlMethods:Collectanddiscarddiseasedbloomsandleaves
Takingcuttingsfromsymptom-freeplantswillpreventspreadLimityourtimegardeninginwetconditionssincesporesprimarilyspread
throughsplashingwater
MoreResourcesforHydrangeaAnthracnose:AlabamaCooperativeExtensionSystem:DiseasesofHydrangea
TennesseeStateUniversity:FoliarDiseasesofHydrangeasPestManagementGuide:HomeGroundsandAnimals
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BestControlMethods:Maintainplantvigor
PlantflowersthatattractbeneficialpredatorslikeLadyBeetles,lacewings,damselbugs,flowerflymaggots,certainparasiticwasps,andbirds
MoreResourcesforControllingAphids:VCEExtension:Aphids
OregonStateExtension:HowtocontrolaphidswithlesstoxicmethodsPermacultureResearchInstitute:PlantsthatAttractBeneficialInsects
PestManagementGuide:HomeGroundsandAnimals
THANK YOU FOR READING!
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