Thrips Management in Blueberries Oscar E. Liburd Entomology and Nematology Department

Thrips Management in Blueberries

Oscar E. Liburd

Entomology and Nematology Department University of Florida

Flower thrips, Frankliniella spp. Adults 1/16 of an inch Yellow-orange coloration Wide host range, rapid colonizers Multiple generations per year Travel along wind currentsBackground

Background - Thrips Lifecycle

MaleFemalePupanon-feedingLarvalfeeding

Flower-thrips species Florida flower thrips WesternEasternOther97%1%1%1%

Goals (2005) Track the movement of flower thrips into blueberry fields

To correlate thrips population with blueberry flower development

3) To evaluate reduced-risk and conventional insecticides for control of thrips in blueberries

Tracking the movement of flower thripsinto blueberry fields

2 Farms were selected Each farm had 49 sampling stations (white sticky traps)Traps were collected every other day for 25 daysCorrelated the number of thrips caught on traps with flower development

Day 3Max 5 thrips/trap0 - 5%40 - 50%Day 7Max 25 thrips/trapRelationship between flower developmentand movement of thrips

Movement of thrips into blueberry fieldsDay 21 Day 13Day 1670 - 80%80 90%Fruit formation100 thrips/trap190 thrips/trap35 thrips/trap

ResultsR = 0.9908; F = 107.8; df = 3,9; P < 0.0001 Size of thrips populations in relation to flower phenology107020901Percentages of opened flowers

QuestionsQ. When do I spray for thrips? Ans. It depends on several factors including history of farmIf you have a history of high thrips population you should begin to spray when 5% of the flowers have openedIf your farm usually experience low thrips population, you can wait until 50% of the flowers have opened to begin your spraying program Q. What should I spray?

Pesticide efficacy results20042005

calibration

vol (ml)ml/s(ft/s)ml/ftml/sqftml/900sqftgal/plot4plotsdistance feetdistance (m)time (s)speed (f/s)

2309.8374679213257.6211.52.1739130435

2359.9449851883257.6213.421.8628912072

23510.0599315068257.6213.161.8996960486

24510.4299702001257.6214.231.7568517217

110.0680887041110.06808870412.01361774081812.2559667450.47118655141.8847462054257.6213.671.8288222385

17013.7651821862257.6215.761.5862944162

13512.8205128205

3258.6206896552

31510.4166666667average

211.4057628321111.40576283212.28115256642053.03730978640.53378970052.1351588022

2754.94604316551.851411446

2354.9767047861

2604.9130763416

2555.0475059382

34.970832557914.97083255790.9941665116894.74986041590.23263496370.9305398548

2909.6989966555

2508.1967213115

2658.6460032626

2658.6460032626

2207.0512820513

48.447801308718.44780130871.68956026171520.60423556820.39535710121.581428405

90015*3*20

dosis/acredosis/plot (900sqft)4 plots

Malathion Yellow1pint0.020669.77583cc39.10332

Esteem White1pint0.020669.77583cc39.10332

Control Orange0

SpinTor Red6oz0.123963.66593cc14.66372

GF 968 Blue+Pink21.3g (AI)0.440058440.058mg1760.232

Assail Pink2.3oz0.0475181.34711g5.38844

Calypso Blue4oz0.082642.44396cc9.77584

Noval Green1.67lb0.034502215.64993g62.59972

sprayer4plots (gal)3 gal

1Malathion Yellow1.884746205439.10332cc62.2417807039

2Esteem White2.135158802239.10332cc54.9420304852

2SpinTor Red2.135158802214.66372cc20.6032263058

3GF 968 Blue+Pink0.93053985481760.232mg5674.8735398874

3Assail Pink0.93053985485.62112cc18.1221254656

4Calypso Blue1.5814284059.77584cc18.5449558813

4Noval Green1.58142840562.59972g118.7528688667

map

Malathion YellowAssail Pink

Esteem WhiteNoval Green

Control OrangeMalathion Yellow

SpinTor RedControl Orange

GF 968 Blue+PinkCalypso Blue

Assail PinkEsteem White

Calypso BlueGF 968 Blue+Pink

Noval GreenSpinTor Red

Esteem WhiteGF 968 Blue+Pink

SpinTor RedControl Orange

GF 968 Blue+PinkEsteem White

Noval GreenNoval Green

Control OrangeCalypso Blue

Assail PinkSpinTor Red

Malathion YellowAssail Pink

Calypso BlueMalathion Yellow

Road

* spiontor --> control corrected in blk 3 (feb 20-2004)

North

flower

0.55252530.07933630.0793363

1.0592490.28885370.2888537

1.10138890.08723830.0872383

1.27063490.14516870.1451687

1.38383840.13145870.1314587

1.41208960.51878970.5187897

1.56049710.31594160.3159416

Average increase in thrips population

flowers

WeekBlocktrtpesticidebudsWeekBlocktrtpesticidebudsWeekBlocktrtpesticidebudsWeekBlocktrtpesticidebuds1/buds

01Assailbefore211Assailafter111Assailafter0.531Assailafter0.59090909091.6923076923

01Calypsobefore111Calypsoafter111Calypsoafter131Calypsoafter0.968751.0322580645

01Controlbefore211Controlafter011Controlafter031Controlafter1.54545454550.6470588235

01Esteembefore111Esteemafter111Esteemafter131Esteemafter11

01GF_968before411GF_968after611GF_968after1.531GF_968after1.60.625

01Malathionbefore211Malathionafter611Malathionafter331Malathionafter2.480.4032258065

01Novalbefore911Novalafter011Novalafter031Novalafter11

01SpinTorbefore311SpinTorafter811SpinTorafter2.666666666731SpinTorafter0.57142857141.75

02Assailbefore412Assailafter812Assailafter232Assailafter3.93333333330.2542372881

02Calypsobefore712Calypsoafter412Calypsoafter0.571428571432Calypsoafter2.96428571430.3373493976

02Controlbefore412Controlafter112Controlafter0.2532Controlafter1.03225806450.96875

02Esteembefore112Esteemafter412Esteemafter432Esteemafter1.59090909090.6285714286

02GF_968before412GF_968after312GF_968after0.7532GF_968after1.20.8333333333

02Malathionbefore212Malathionafter512Malathionafter2.532Malathionafter1.11111111110.9

02Novalbefore612Novalafter312Novalafter0.532Novalafter1.09259259260.9152542373

02SpinTorbefore012SpinTorafter212SpinTorafter132SpinTorafter1.14814814810.8709677419


03Calypsobefore213Calypsoafter313Calypsoafter1.533Calypsoafter0.79032258061.2653061224

03Controlbefore213Controlafter813Controlafter433Controlafter1.20.8333333333

03Esteembefore113Esteemafter313Esteemafter333Esteemafter1.44444444440.6923076923

03GF_968before013GF_968after613GF_968after133GF_968after0.91111111111.0975609756

03Malathionbefore313Malathionafter113Malathionafter0.333333333333Malathionafter1.46666666670.6818181818


03SpinTorbefore213SpinTorafter513SpinTorafter2.533SpinTorafter1.840.5434782609


04Calypsobefore114Calypsoafter214Calypsoafter234Calypsoafter0.9251.0810810811

04Controlbefore214Controlafter514Controlafter2.534Controlafter2.2758620690.4393939394

04Esteembefore314Esteemafter814Esteemafter2.666666666734Esteemafter1.50.6666666667

04GF_968before214GF_968after814GF_968after434GF_968after1.37142857140.7291666667

04Malathionbefore214Malathionafter414Malathionafter234Malathionafter1.18421052630.8444444444


04SpinTorbefore014SpinTorafter414SpinTorafter134SpinTorafter0.67741935481.4761904762

21Assailbefore2231Assailafter1331Assailafter0.5909090909

21Calypsobefore3231Calypsoafter3131Calypsoafter0.96875

21Controlbefore3331Controlafter5131Controlafter1.5454545455

21Esteembefore6231Esteemafter6231Esteemafter1

21GF_968before3031GF_968after4831GF_968after1.6meanvarianceerr

21Malathionbefore2531Malathionafter6231Malathionafter2.48Assail0.55252530.01888280.0793363

21Novalbefore3731Novalafter3731Novalafter1SpinTor1.0592490.33374590.2888537

21SpinTorbefore5631SpinTorafter3231SpinTorafter0.5714285714Novaluron1.10138890.03044210.0872383

22Assailbefore1532Assailafter5932Assailafter3.9333333333GF9681.27063490.08429580.1451687

22Calypsobefore2832Calypsoafter8332Calypsoafter2.9642857143Knack1.38383840.06912560.1314587

22Controlbefore6232Controlafter6432Controlafter1.0322580645Calypso1.41208961.07657110.5187897

22Esteembefore4432Esteemafter7032Esteemafter1.5909090909Malathion1.56049710.39927640.3159416

22GF_968before5032GF_968after6032GF_968after1.2

22Malathionbefore5432Malathionafter6032Malathionafter1.1111111111

22Novalbefore5432Novalafter5932Novalafter1.0925925926

22SpinTorbefore5432SpinTorafter6232SpinTorafter1.1481481481




23Esteembefore4533Esteemafter6533Esteemafter1.4444444444








24Esteembefore4634Esteemafter6934Esteemafter1.5





Data

WeekBlocktrttrapspesticidebudsWeek 1= feb 5-2004

01Assail5before

01Calypso4before

01Control6before

01Esteem5before

01GF_9689before

01Malathion1before

01Noval7before

01SpinTor1before

02Assail2before

02Calypso2before

02Control6before

02Esteem3before

02GF_9682before

02Malathion0before

02Noval9before

02SpinTor1before

03Assail6before

03Calypso4before

03Control1before

03Esteem13before

03GF_9682before

03Malathion2before

03Noval1before

03SpinTor10before

04Assail5before

04Calypso8before

04Control1before

04Esteem8before

04GF_9682before

04Malathion4before

04Noval3before

04SpinTor4before

11Assail54after

11Calypso26after

11Control17after

11Esteem82after

11GF_96874after

11Malathion34after

11Noval23after

11SpinTor20after

12Assail40after

12Calypso37after

12Control48after

12Esteem32after

12GF_96868after

12Malathion38after

12Noval64after

12SpinTor21after

13Assail15after

13Calypso32after

13Control36after

13Esteem71after

13GF_96822after

13Malathion35after

13Noval12after

13SpinTor35after

14Assail17after

14Calypso65after

14Control26after

14Esteem96after

14GF_96852after

14Malathion70after

14Noval66after

14SpinTor59after

21Assail115before1

21Calypso39before

21Control104before0

21Esteem214before1

21GF_968191before

21Malathion74before6

21Noval149before0

21SpinTor40before

22Assail167before

22Calypso115before4

22Control210before

22Esteem7before4

22GF_968236before

22Malathion95before

22Noval323before

22SpinTor72before2

23Assail81before

23Calypso251before3

23Control211before8

23Esteem362before3

23GF_96895before6


23Noval45before5

23SpinTor280before5

24Assail77before

24Calypso266before2

24Control129before5

24Esteem286before8

24GF_96895before


24Noval437before3

24SpinTor30beforeon the ground

31Assail41after

31Calypso63after

31Control55after

31Esteem215after

31GF_96881after

31Malathion49after

31Noval103after

31SpinTor54after

32Assail77after

32Calypso55after

32Control267after

32Esteem201after

32GF_968191after

32Malathion46after

32Noval175after

32SpinTor104after

33Assail23after

33Calypso174after

33Control136after

33Esteem292after

33GF_96858after

33Malathion50after

33Noval66after

33SpinTor142after

34Assail43after

34Calypso256after

34Control189after

34Esteem248after

34GF_968193after

34Malathion153after

34Noval222after

34SpinTor194after

Sheet1

dateaft-beftrtblkthips-traps3-Marafteractara1170.9444444444

10-Febbeforeactara11524-Febbeforeactara118

10-Febbeforeactara2363-Marafteractara21673.4081632653

10-Febbeforeactara31924-Febbeforeactara249

10-Febbeforeactara4203-Marafteractara3291.5263157895

10-Febbeforeassail11224-Febbeforeactara319

10-Febbeforeassail2123-Marafteractara4641.2549019608

10-Febbeforeassail31924-Febbeforeactara451

10-Febbeforeassail4393-Marafterassail1291.2608695652

10-Febbeforecontrol12224-Febbeforeassail123

10-Febbeforecontrol2133-Marafterassail2510.8947368421

10-Febbeforecontrol31724-Febbeforeassail257

10-Febbeforecontrol4403-Marafterassail3371.6818181818

10-Febbeforemalath11324-Febbeforeassail322

10-Febbeforemalath2143-Marafterassail4841.5

10-Febbeforemalath32524-Febbeforeassail456

10-Febbeforemalath4223-Maraftercontrol1281.4

10-Febbeforenoval11524-Febbeforecontrol120

10-Febbeforenoval2143-Maraftercontrol21445.5384615385

10-Febbeforenoval33624-Febbeforecontrol226

10-Febbeforenoval4273-Maraftercontrol3381.5833333333

10-Febbeforespintor1724-Febbeforecontrol324

10-Febbeforespintor2203-Maraftercontrol41111.734375

10-Febbeforespintor31724-Febbeforecontrol464

10-Febbeforespintor4213-Maraftermalath1664.125

10-FebbeforeTD11624-Febbeforemalath116

10-FebbeforeTD2163-Maraftermalath21493.725

10-FebbeforeTD31824-Febbeforemalath240

10-FebbeforeTD4173-Maraftermalath3652.3214285714

24-Febafteractara11824-Febbeforemalath328

24-Febafteractara2493-Maraftermalath4902.5714285714

24-Febafteractara31924-Febbeforemalath435

24-Febafteractara4513-Marafternoval1190.6551724138

24-Febafterassail12324-Febbeforenoval129

24-Febafterassail257++3-Marafternoval21223.4857142857

24-Febafterassail32224-Febbeforenoval235

24-Febafterassail4563-Marafternoval3341.5454545455

24-Febaftercontrol124-Febbeforenoval322

24-Febaftercontrol2263-Marafternoval4573

24-Febaftercontrol32424-Febbeforenoval419

24-Febaftercontrol4643-Marafterspintor1532.12

24-Febaftermalath11624-Febbeforespintor125

24-Febaftermalath2403-Marafterspintor21254.8076923077

24-Febaftermalath32824-Febbeforespintor226

24-Febaftermalath4353-Marafterspintor3120.5

24-Febafternoval12924-Febbeforespintor324

24-Febafternoval2353-Marafterspintor4753.125

24-Febafternoval32224-Febbeforespintor424

24-Febafternoval419++3-MarafterTD1572.7142857143

24-Febafterspintor12524-FebbeforeTD121

24-Febafterspintor2263-MarafterTD2891.328358209

24-Febafterspintor32424-FebbeforeTD267

24-Febafterspintor4243-MarafterTD3292.0714285714

24-FebafterTD12124-FebbeforeTD314

24-FebafterTD2673-MarafterTD4611.3555555556

24-FebafterTD31424-FebbeforeTD445

24-FebafterTD445

3-Marbeforeactara117




3-Marbeforeassail129




3-Marbeforecontrol128




3-Marbeforemalath166




3-Marbeforenoval119

3-Marbeforenoval2122

3-Marbeforenoval334

3-Marbeforenoval457

3-Marbeforespintor153




3-MarbeforeTD157

3-MarbeforeTD289

3-MarbeforeTD329

3-MarbeforeTD461

Chart1

1.2

1.3611111111

1

2.55

1.9166666667

4.75

1.1578947368

1.4358974359

2

2

1.4117647059

1.6

1.2307692308

2.8571428571

1.12

1.5909090909

1.9333333333

2.5

0.6111111111

0.7037037037

3.5714285714

1.3

1.4117647059

1.1428571429

1.3125

4.1875

0.7777777778

2.6470588235

Sheet2

actara11.20.9819330446trtblkaverage

actara21.36111111110.9696402661actara11.0722222222

actara311actara22.3846371882

actara42.550.9106384465actara31.2631578947

assail11.91666666670.9370124061actara41.9024509804

assail24.750.855717944assail11.5887681159

assail31.15789473680.9854465922assail22.8223684211

assail41.43589743590.964467634assail31.4198564593

control120.9330329915assail41.4679487179

control220.9330329915control11.7

control31.41176470590.9661037502control23.7692307692

control41.60.9540870513control31.4975490196

malath11.23076923080.9794501497control41.6671875

malath22.85714285710.9003405373malath12.6778846154

malath31.120.9887311065malath23.2910714286

malath41.59090909090.9546308471malath31.7207142857

noval11.93333333330.936201486malath42.0811688312

noval22.50.9124435366noval11.2942528736

noval30.61111111111.0504804685noval22.9928571429

noval40.70370370371.0357644868noval31.0782828283

spintor13.57142857140.8804725143noval41.8518518519

spintor21.30.9741047583spintor12.8457142857

spintor31.41176470590.9661037502spintor23.0538461538

spintor41.14285714290.9867356184spintor30.9558823529

TD11.31250.9731730394spintor42.1339285714

TD24.18750.8665717319TD12.0133928571

TD30.77777777781.0254498997TD22.7579291045

TD42.64705882350.9072430308TD31.4246031746

actara10.94444444441.005732208TD42.0013071895

actara23.40816326530.8846020895

actara31.52631578950.9585958849

actara41.25490196080.9775500904

assail11.26086956520.9770864346

assail20.89473684211.0111846492

assail31.68181818180.9493406899

assail41.50.9602645008

control11.40.9669125483

control25.53846153850.8426768935

control31.58333333330.9550866277

control41.7343750.9464239012

malath14.1250.8678758522

malath23.7250.8767734137

malath32.32142857140.9192305882

malath42.57142857140.9098767203

noval10.65517241381.0431924607

noval23.48571428570.8826140192

noval31.54545454550.9574021014

noval430.8959584598

spintor12.120.9276121189

spintor24.80769230770.8546854949

spintor30.51.0717734625

spintor43.1250.8923084338

TD12.71428571430.9049705448

TD21.3283582090.9720049567

TD32.07142857140.9297645936

TD41.35555555560.9700369286

final

1.620.30.3

1.80.420.42

1.820.330.33

2.040.270.27

2.240.470.47

2.4420.270.27

Actara 25 WG Diamond .83EC Assail 70W TD 2480 SpinTor 2SC Malathion 5EC

Average population increase rate

Sheet3

Actara 25 WG1.620.3

Diamond .83EC1.80.42

Assail 70W1.820.33

TD 24802.040.27

SpinTor 2SC2.240.47

Malathion 5EC2.4420.27

Effect of SpinTor on thrips population over 48 hours

Chart1

25231721.5

53128

9141714

Rep 1

Rep2

Rep3

Rep4

Hours after Application

No. of Thrips

Chart2

27.62

7

13.5

Aver. no. of Thrips

Hours after Application

Mean # of Thrips

Sheet2

Untreated24Hours48Hours72 HoursUntreated24 Hours48 Hours72 ours

Rep 1255973Aver. no. of Thrips27.62713.530.5

Rep22331474

Rep317121720

Rep421.581415

Average21.62713.545.5

Sheet3

QuestionWhat is the relationship between thrips numbers and injury?

Thrips Injury Flower protection Hand pollination Thrips release Flower protection Fruit formation counting

Thrips Injury fruits0 thrips /flower

Thrips Injury fruitsOviposition Injury(5 to 10 thrips / flower)

Thrips Injury Fruit dehydration 20 thrips /flower

Thrips Injury Average S.E.M.

regresion #

1

4

3

3

4

1

4

4

3

4

3

2

3

4

3

3

3

3

4

3

regresion %

70.29655.15662

65.509658.329662

62.90454.48460

58.92250.40254

No. of thrips per flower

% of fruit formed

Chart3

627.577.57

623.593.59

604.214.21

544.264.26

data

thripsthreefruitsper**1.7ono

01120162.8362126148219.7121086612fracasinastw

024801718.90936564382664.1702636860.20.20135792080.463647609104857600000000000000000000

033601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

043601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

054801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

01120162.8362126148219.71210866120.80.9272952181.1071487178115292150460684700000000000000000000000

024801718.90936564382664.1702636860.20.20135792080.463647609104857600000000000000000000

034801718.90936564382664.1702636860.80.9272952181.1071487178115292150460684700000000000000000000000

043601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

054801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

213601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

22240529.0564156397765.0819998320.60.64350110880.8860771238365615844006297640000000000000000000

233601054.04008087881587.34837119910.40.41151684610.684719203109951162777600000000000000000000

244801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

253601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

213601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

223601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

233601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

244801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

253601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

101240529.0564156397765.0819998320.60.64350110880.8860771238365615844006297640000000000000000000

1023601054.04008087881587.34837119910.40.41151684610.684719203109951162777600000000000000000000

1034801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

1043601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

1053601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

101240529.0564156397765.0819998320.60.64350110880.8860771238365615844006297640000000000000000000

1023601054.04008087881587.34837119910.40.41151684610.684719203109951162777600000000000000000000

1034801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

1043601054.04008087881587.34837119910.80.9272952181.1071487178115292150460684700000000000000000000000

1053601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

201240529.0564156397765.0819998320.60.64350110880.8860771238365615844006297640000000000000000000

202240529.0564156397765.0819998320.40.41151684610.684719203109951162777600000000000000000000

203240529.0564156397765.0819998320.40.41151684610.684719203109951162777600000000000000000000

2043601054.04008087881587.34837119910.40.41151684610.684719203109951162777600000000000000000000

2053601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

201240529.0564156397765.0819998320.60.64350110880.8860771238365615844006297640000000000000000000

2023601054.04008087881587.34837119910.40.41151684610.684719203109951162777600000000000000000000

2033601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

2043601054.04008087881587.34837119910.60.64350110880.8860771238365615844006297640000000000000000000

2054801718.90936564382664.1702636860.60.64350110880.8860771238365615844006297640000000000000000000

0.80.9272952181.1071487178115292150460684700000000000000000000000

avesem.+sem.-sem

0627.5762.72670.29655.156

2623.5961.919665.509658.3296

10604.2158.69462.90454.484

20544.2654.66258.92250.402

-0.4032258065m

thrips/hathrips/plantthrips/flower

c40$/haELI2204444.444444442204.44444444440.2204444444

v6000$/ton

d0.000000003ton/ha

k054269942

-0.403

thrips/hathrips/plantthrips/flower

c617.43$/haELI54300349.71630954300.3497163095.4300349716

v6000$/ton

d0.000000003ton/ha

k0.373(1-60%)54269942

IFAS Entomology & Nematology:3 $/lb

like the idea but your estimated number of flowers per plant is muchtoo low. To make an estimate, I would work backward from the expectedberry yield on a mature rabbiteye blueberry planting in Georgia orFlorida. My yield estimate may seem high but a lot of fruit is lostduring mechanical harvest and during fruit sorting that happens in thepacking house.

Assume average berry weight of rabbiteye is 1.2 grams.

Assume yield per acre at 15,000 pounds, with a planting rate of 1,000plants per acre. 37065.

This would be 15 pounds per plant or 6,800 grams.

Berries per bush would be 6,800 / 1.2 = 5,675.

Assuming a 60% fruit set, which is high for rabbiteye, there would be9,458 flowers per bush.

So I would estimate about 10,000 flowers per bush.

d= (%/100)* (Lb/plant)/(lb/Ton)/10000flowers/bush

IFAS Entomology & Nematology:3 $/lb

Sheet2

Sheet3

Thrips Injury oviposition 2 blueberry species in FL

250 flower per species

27C and 80% RH

15 days

Style Fruits Petals Ovaries

Thrips Injury ovipositionabccF = 19.16; df = 3,46; P < 0.001

Sheet1

PlaceTissuereplarvassqeggstype

Haines_CityPetals1265.0990195136highbush


Haines_CityPetals311highbush


Haines_CityOvary1174.1231056256highbush

Haines_CityOvary2164highbush



Haines_CityStile111highbush




Haines_CityFruit100highbush





GainesvillePetals121.4142135624highbush

GainesvillePetals200highbush



GainesvilleOvary100highbush

GainesvilleOvary221.4142135624highbush



GainesvilleStile100highbush




GainesvilleFruit100highbush





GainesvillePetals193rabiteye

GainesvillePetals262.4494897428rabiteye



GainesvilleOvary111rabiteye



GainesvilleOvary482.8284271247rabiteye

GainesvilleStile100rabiteye




GainesvilleFruit100rabiteye





Chart1

11.253.553.55

4.411.761.76

0.160.110.11

000

Flower tissues

Average No. of thrips emerging / 10 flowers

Sheet2

Petals11.253.55

Ovary4.411.76

Style0.160.11

Fruit00

Sheet3

Conclusions Flower-thrips reduce the quality and quantity of the blueberries7 days after bloom the initiation of hot-spots are definedThrips are present in blueberry fields for about 25 days from flower opening to petal fall In cases where there are high populations of thrips, insecticides could be more effective if applied when the hot-spots are defined (5-10 days after bloom) Assail, Diamond and Actara have shown to be significantly more effective than Malathion in controlling thrips population in blueberry fields

AcknowledgementsFlorida Blueberry Growers Association (FBGA)Michigan Blueberry Growers Association (MBG)Florida and Georgia blueberry growers Southern Region EPA grant #: X8-96424405-0Small Fruit and Vegetable Lab at UF

Thrips Management in Blueberries Oscar E. Liburd Entomology and Nematology Department

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Transcript of Thrips Management in Blueberries Oscar E. Liburd Entomology and Nematology Department