Stink Bug and Lepidopteran Control in Soybean

Transcription

1 LATMC 2010: Grain Crops Session Stink Bug and Lepidopteran Control in Soybean J. Davis, B. R. Leonard, and J. Baldwin Department of Entomology Louisiana State University Agricultural Center

2 Topics to Cover Stink bug control options Action Thresholds Insecticides Site Specific Insecticide Applications Host Plant Resistance = Varietal Differences Lepidopteran Defoliators New invasive soybean pests to watch for

3 Stink Bugs

4 Stink bug feeding: -Reduces yield, quality and oil content -Causes delayed maturity

5 Soybean Yield and Quality 2008 Treatment % seed dmg Yield (bu/a) % Oil Non-treated 63 a 21 b 19.6 ± 0.5 b Treated* 31 b 37 a 21.1 ± 0.2 a *Treated 4 times w/acephate

6 Delayed Maturity

7 LA Stink Bug Species Composition MRRS-2009 Brown Complex 100% Green Complex 75% 50% Red Banded 25% 0% Group 4 Group 5 Group 6 Total

8 Common name: redbanded stink bug Scientific name: Piezodorus guildinii (Westwood)

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10 Piezodorus guildinii US Distribution Positive ID 2009

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12 Redbanded Stink Bug: Cumulative Damage and Action Thresholds

13 Assessing Insect Severity: Define action thresholds for redbanded stink bug based on yield and quality Stink Bug Damage Accumulated Over Time

14 % damaged seed 74 a 50 b R b 16 c 10 c 5 c

15 bugs per 25 sweeps

16 k bugs per 25 sweeps

17 Yield (bu/a) 6 ± 3 c 12 ± 1 b 17 ± 5 b 31 ± 2 a 39 ± 6 a 38 ± 6 a

18 Redbanded Stink Bug Control:

19 ecticide Efficacy Against All Stink Bugs, Karate 2.08CS (0.0312) Endigo 2.06EC (0.0724) Orthene 90SP (0.9) Brigade 2EC (0.078) Baythroid XL 1EC (0.0219) + Orthene (0.675) Mustang Max 0.8EC (0.025) Leverage 2.7SE (0.08) Non-treated P<0.01 P<0.01 P< b c c bc c bc bc a b b b b b b b a b b b b b b b a 0 2 DAT 7 DAT 8 DAT

20 Insecticide Efficacy Against RBSB Discipline 2EC (0.025) Discipline 2EC (0.05) Discipline 2EC (0.075) Discipline 2EC (0.1) Hero 1.24EC (0.025) Hero 1.24EC (0.05) Hero 1.24EC (0.075) Hero 1.24EC (0.1) Orthene 90SP (1.0) 5 Non-treated 2 P<0.01 P<0.01 P<

21 Insecticide Use Strategies For Redbanded Stink Bugs Treatments Acephate Endigo, SP + Orthene, Leverage Bifenthrin, Hero Application Frequency 3-5 sprays/acre/year 5-7 day interval

22 Redbanded Stink Bug Control:

23 aluate redbanded stink bug control options: Site Specific Field Applications If stink bugs are aggregated along field edges, spray only these edges Reduce amount of product used and application time Save grower money and protect natural enemies

24 an applications along eld edges reduced field lonization by stink ug? YES 21 bu/a educed field lonization by two eeks educed overall stink ug populations when ybeans had reached 6 per 25 sweeps on eld edges per 25 sweeps in field terior 37 bu/a 37 bu/a

25 Soybean e, Tensas Parish 2008 Cotton Corn

26 Field Verification of Stink Bug Movement Sweetpotato t, Washington, LA 2009 ; gridded 150 x 50 eekly

27 Sweetpotato

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29 Sweetpotato

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31 Redbanded Stink Bug Control:

32 tink bugs/25 sweeps/week 6 (from R3 to R8) % green stems 60 ged seed (Stink Bugs) 69 Yield 57 bu/a Terral 48R14 Untreated

33 tink bugs/25 sweeps/week 1 (from R3 to R8) % green stems 30 ged seed (Stink Bugs) 57 Terral 48R14 Treated Yield 58 bu/a

34 tink bugs/25 sweeps/week 2 (from R3 to R8) % green stems 5 ged seed (Stink Bugs) 30 Pioneer 95Y20 Untreated Yield 58 bu/a

35 tink bugs/25 sweeps/week 0 (from R3 to R8) % green stems 0 ged seed (Stink Bugs) 16 Discounted Yield 62 bu/a Pioneer 95Y20 Yield 76 bu/a

36 oragen Belt Non-treated teward trepid arvin

37 fficacy of new and current insecticides for control of soybean loopers

38 fficacy of new and current insecticides for control of soybean loopers ment/ ulation Rate lb (AI)/acre m Flexi 40%WG m Flexi 40%WG m Xpress 150ZC m Xpress 150ZC rd 150SC e w/zeon 250CS o 2.06EC id 2SC thiamethoxam + chlorantraniliprole lambda-cyhalothrin + chlorantraniliprole indoxacarb lambda-cyhalothrin lambda-cyhalothrin + thiamethoxam methoxyfenozide

39 fficacy of new and current insecticides for control of soybean loopers Treatment/ Mean number of SBL per 25 sweeps Formulation 3 DAT % control 7 DAT % control UTC 25.3a 32.8a Voliam Flexi 40%WG 2.0c c 99 Voliam Flexi 40%WG 1.8c c 100 Voliam Xpress 150ZC 0.3c c 100 Voliam Xpress 150ZC 0.0c c 100 Steward 150SC 2.3c c 100 Karate w/zeon 250CS 12.0b b 59 Endigo 2.06EC 12.5b b 59 Intrepid 2SC 5.8bc c 98

40 Residual efficacy of new and current nsecticides for control of soybean loopers

41 Residual efficacy of new and current insecticides for control of soybean loopers Percent Control atment Rate 14 DAT 21 DAT lt SC 3.0 oz/a ragen 5.0 oz/a repid 2F 4.0 oz/a rvin oz/a ward 150EC 6.4 oz/a 24 19

42 nitoring for Soybean Looper Tolerance to Intrepid 2F cted from 4 sites in LA in 2009 g a diet incorporated method arch is ongoing

43 AgCenter recommends co-applications with pyrethroids

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45 mon name: wn marmorated stink

46 rown marmorated stink bug Importance: invasive; Native to Asia Agricultural pest of apples, pears, peaches, figs, mulberries, citrus, persimmon and soybeans

47 mon name: Bean plataspid ntific name: Megacopta cribraria

48 sive; native to China ous pest of soybean an cause up to 50% yield loss ently, found in Georgia on kudzu

49 uisiana oybean And Grain Board