Insect Pest Management in Virginia Cotton, Peanut, and Soybean

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Test: SB11-CEW-Worrell-2, Efficacy of foliar-applied pesticides against corn earworm in soybean # Material Rate Date(s) treated 1 Fastac 4 oz/A Aug 12 2 Prevathon 0.43SC 9.8 oz/A Aug 12 (or DPX-E2Y45 5%SC) 3 Prevathon 0.43SC 13.4 oz/A Aug 12 (or DPX-E2Y45 5%SC) 4 Prevathon 0.43SC 4 oz/A Aug 12 (or DPX-E2Y45 5%SC) + Asana XL 4.5 oz/A 5 Besiege 2EC 9 oz/A Aug 12 6 Belt 4SC 2 oz/A Aug 12 7 Steward 1.25EC 6 oz/A Aug 12 8 DiPel ES (Kur.) 1 pt Aug 12 9 Karate Z 0.96 oz Aug 12 10 Karate Z 1.6 oz Aug 12 11 DiPel ES (Kur.) 1 pt Aug 12 + Karate Z 0.96 oz 12 DiPel ES (Kur.) 1 pt Aug 12 + Karate Z 1.6 oz 13 Endigo ZCX 4.5 oz/A Aug 12 14 Untreated Test: SB11-CEW-Worrell-2 Year: 2011 Crop: Soybean Variety: Pioneer 95M82 Field: n/a Location: Kenneth Worrell farm, Suffolk, VA Experimental design: RCBD Plot size: 40’ Row spacing: 7.5” Planting date: Jun. 14 Harvest date: n/a Row feet harvested: n/a Treatment application(s): Broadcast using backpack Nozzle type: 8002VS Nozzle spacing: 18” PSI: 17.9 GPA: 14.3 Comments: Mandibular dissection indicated 92% corn earworm larvae and 8% tobacco budworm larvae on August 12 (n=25). 149
Table 76. Mean number of larvae per 10 sweeps and percent control 1 , SB11CEW-Worrell-2 (Kenneth Worrell farm, Suffolk, VA). Tidewater AREC, Suffolk, VA, 2011. Insecticide treatments were applied on August 12. Aug 15 Aug 18 # Material Rate/A Small larvae Medium larvae Large larvae Total larvae Small larvae Medium larvae Large larvae Total larvae % control 1 Fastac 4 oz 1.00 cd 1.25 d-f 0.50 d 2.75 d-f 0.75 bc 1.75 c-e 1.50 b-e 4.00 d-g 79.7 2 Prevathon 0.43SC 9.8 oz 0.75 cd 2.50 b-e 0.50 d 3.75 c-f 0.50 c 0.50 de 1.00 b-e 2.00 f-h 82.7 3 Prevathon 0.43SC 13.4 oz 0.75 cd 2.25 b-f 1.00 cd 4.00 c-f 0.25 c 0.50 de 0.75 c-e 1.50 gh 83.5 4 Prevathon 0.43SC 4 oz 2.00 b-d 1.00 d-f 0.50 d 3.50 c-f 0.25 c 0.50 de 0.25 e 1.00 gh 86.5 + Asana XL 4.5 oz 5 Besiege 2EC 9 oz 0.25 d 0.75 d-f 0.25 d 1.25 ef 0.00 c 0.25 e 0.25 e 0.50 h 94.7 6 Belt 4SC 2 oz 3.75 b 1.00 d-f 1.75 b-d 6.50 b-d 1.00 bc 1.00 de 0.75 c-e 2.75 e-h 72.2 7 Steward 1.25EC 6 oz 1.00 cd 0.00 f 0.00 d 1.00 ef 0.25 c 0.25 e 0.50 de 1.00 gh 94.0 8 DiPel ES (Kur.) 1 pt 2.25 b-d 4.00 ab 3.50 ab 9.75 b 2.00 bc 2.25 b-d 2.25 a-d 6.50 b-d 51.1 9 Karate Z 0.96 oz 1.50 b-d 3.75 a-c 2.75 a-c 8.00 bc 2.75 b 3.75 b 2.75 ab 9.25 b 48.1 10 Karate Z 1.6 oz 0.00 d 0.50 ef 0.25 d 0.75 f 0.75 bc 1.25 de 1.75 b-e 3.75 d-h 86.5 11 DiPel ES (Kur.) 1 pt 1.75 b-d 2.25 b-f 1.75 b-d 5.75 b-e 0.00 c 1.50 c-e 3.75 a 5.25 c-f 66.9 + Karate Z 0.96 oz 12 DiPel ES (Kur.) 1 pt 2.75 bc 3.00 b-d 1.50 b-d 7.25 b-d 2.75 b 3.25 bc 2.50 a-c 8.50 bc 52.6 + Karate Z 1.6 oz 13 Endigo ZCX 4.5 oz 0.25 d 1.50 c-f 0.75 cd 2.50 d-f 1.00 bc 2.25 b-d 2.25 a-d 5.50 c-e 75.9 14 Untreated 6.75 a 6.00 a 4.00 a 16.75 a 6.00 a 6.50 a 4.00 a 16.50 a --- LSD 2.42 2.50 2.24 4.87 2.14 1.86 1.83 3.50 --- Means within a column followed by the same letter(s) are not significantly different (Protected LSD, P=0.05). 1 Percent control is based on cumulative larval days (CLD) in the treatment relative to the untreated control. CLD’s are calculated with the following equation: Σ (X i+1 – X i )[(Y i + Y i+1 )/2], where X i and X i+1 are adjacent sample dates and Y i and Y i+1 are corresponding points of total larvae per 10-sweep sample. There were 49.9 CLD’s in the untreated control.
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2011 Insect Pest Management in Virg
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ACKNOWLEDGMENTS The authors wish to
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INDEPENDENT CROP CONSULTANTS Chad H
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Contents Acknowledgments ..........
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Climatological Summary of the 2011
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Table 2. Daily precipitation (inche
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Table 3. Soil types, nutrient analy
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Test: CT11-THP-Regional-Irrigated,
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Table 4. Thrips injury ratings 1 ,
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Table 6. Plant height 1 , number of
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Test: CT11-THP-Regional-Dryland, Ef
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Table 10. Plant height 1 , number o
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Test: CT11-THP-Regional-Foliar, Eff
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Table 14. Plant height 1 , number o
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Test: CT11-THP-Regional-Eastern, Va
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Table 16. Thrips injury ratings and
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Test: CT11-THP-Bayer, Evaluation of
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Table 19. Thrips injury ratings and
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Test: CT11-THP-Dow, Efficacy of fol
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Table 21. Stand counts, thrips inju
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Test: CT11-THP-PHY, Test to evaluat
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Table 23. Stand counts, thrips inju
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Table 24. Stand counts, number of n
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Table 26. Mean number of thrips per
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Treatment application(s): Liquid in
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Table 29. Stand counts, plant heigh
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Treatment application(s): Broadcast
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Treatment means (% bollworm damage,
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Table 31. Percent external bollworm
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Test: CT11-BW4, Efficacy of selecte
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Lint 2 Table 35. Percent external b
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Treatment application(s): Broadcast
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Test: CT11-SBUG-Valent, Evaluation
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Table 39. Percent internal boll dam
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Test: PT11-THP-1, Evaluation of in-
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Table 42. Stand counts, PT11-THP-1.
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Test: PT11-THP-2, Evaluation of liq
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Table 46. Stand counts and yield, P
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Page 99 and 100: Treatment application(s): Liquid in
Page 101 and 102: Table 50. Thrips injury ratings 1 ,
Page 103 and 104: Treatment application(s): Broadcast
Page 105 and 106: Table 52. Thrips injury ratings 1 ,
Page 107 and 108: Test: PT11-THP-Syngenta-1, Evaluati
Page 109 and 110: Table 54. Stand counts and thrips i
Page 111 and 112: Table 56. Tomato spotted wilt virus
Page 113 and 114: Treatment application(s): Granular
Page 115 and 116: Table 58. Mean number of thrips per
Page 117 and 118: Test: PT11-THP-VA Lines, Evaluation
Page 119 and 120: Table 61. Thrips injury ratings and
Page 121 and 122: Table 62. Stand counts on May 19 an
Page 123 and 124: Table 63. Mean number of larvae per
Page 125 and 126: Treatment application(s): Full cove
Page 127 and 128: Test: PT11-CEW-3, Evaluation of fol
Page 131 and 132: Table 66. Southern corn rootworm me
Page 133 and 134: Test: SB11-SEED-1, Evaluation of se
Page 135 and 136: Table 68. Thrips injury ratings 1 a
Page 137 and 138: Table 69. Stand counts, thrips coun
Page 139 and 140: Test: SB11-BMSB-1, Efficacy of foli
Page 141 and 142: Table 71 (continued). Mean number o
Page 143 and 144: Table 72. Mean number of brown marm
Page 145 and 146: Table 73. Mean number of brown marm
Page 149: Table 75. Mean number of larvae per
Page 153 and 154: Table 77. Mean number of insects pe
Page 155 and 156: Table 79. Results of the 2011 Virgi
Page 157 and 158: Figure 1. Corn earworm regression.
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Insect Pest Management in Virginia Cotton, Peanut, and Soybean

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