Insect Pest Management in Virginia Cotton, Peanut, and Soybean

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Test: SB11-CEW-Speight, Efficacy of foliar-applied pesticides against corn earworm in soybean # Material Rate Date(s) treated 1 Steward 1.25EC 6 oz/A Aug 12 2 Steward 1.25EC 10 oz/A Aug 12 3 Steward 1.25EC 6 oz/A Aug 12 + Baythroid XL 2 oz/A 4 Belt 4SC 2 oz/A Aug 12 5 Belt 4SC 3 oz/A Aug 12 6 Belt 4SC 2 oz/A Aug 12 + Baythroid XL 2 oz/A 7 Baythroid XL 2.8 oz/A Aug 12 + Orthene 97 8 oz/A 8 Larvin 3.2 10 oz/A Aug 12 9 Larvin 3.2 16 oz/A Aug 12 10 Larvin 3.2 10 oz/A Aug 12 + Baythroid XL 2 oz/A 11 Cobalt 19 oz/A Aug 12 12 Untreated Test: SB11-CEW-Speight Year: 2011 Crop: Soybean Variety: MFS-541 Field: n/a Location: Speight farm, Suffolk, VA Experimental design: RCBD Plot size: 9 rows x 40’ Row spacing: 15” Planting date: Jun. 17 Harvest date: n/a Row feet harvested: n/a Treatment application(s): Broadcast using full coverage boom Nozzle type: D2-13 Nozzle spacing: 3 nozzles per row PSI: 42 GPA: 14.7 Comments: Pre-treatment counts on August 12 indicated 6.0 small, 12.5 medium, and 8.5 lar larvae per 15 sweeps. Mandibular dissection indicated 96% corn earworm larvae and 4% tobacco budworm larvae on August 12 (n=25) and 100% corn earworm larvae on August 18 (n=25). 145
Table 74. Mean number of larvae per 10 sweeps and percent control 1 , SB11CEW-Speight (Speight farm, Suffolk, VA). Tidewater AREC, Suffolk, VA, 2011. Insecticide treatments were applied on August 12. Aug 15 Aug 18 # Material Rate Small larvae Medium larvae Large larvae Total larvae Small larvae Medium larvae Large larvae Total larvae % control 1 Steward 1.25EC 6 oz/A 6.25 1.50 b 1.50 b 9.25 b 0.00 b 1.25 b 1.00 b 2.25 b 83.2 2 Steward 1.25EC 10 oz/A 0.00 0.50 b 0.00 b 0.50 c 0.00 b 0.50 b 0.00 b 0.50 b 98.5 3 Steward 1.25EC + Baythroid XL 6 oz/A 2 oz/A 0.00 0.00 b 0.50 b 0.50 c 0.00 b 0.75 b 1.00 b 1.75 b 96.7 4 Belt 4SC 2 oz/A 0.75 3.00 b 1.00 b 4.75 bc 0.25 b 0.25 b 1.00 b 1.50 b 90.8 5 Belt 4SC 3 oz/A 0.25 3.25 b 1.25 b 4.75 bc 0.00 b 0.00 b 0.50 b 0.50 b 92.3 6 Belt 4SC + Baythroid XL 7 Baythroid XL + Orthene 97 2 oz/A 2 oz/A 2.8 oz/A 8 oz/A 0.25 0.25 b 0.00 b 0.50 c 0.00 b 0.25 b 0.25 b 0.50 b 98.5 0.25 0.50 b 0.00 b 0.75 c 0.00 b 0.00 b 0.50 b 0.50 b 98.2 8 Larvin 3.2 10 oz/A 1.25 1.25 b 0.25 b 2.75 bc 0.00 b 0.00 b 0.50 b 0.50 b 95.2 9 Larvin 3.2 16 oz/A 0.00 0.25 b 0.25 b 0.50 c 0.00 b 0.00 b 1.25 b 1.25 b 97.4 10 Larvin 3.2 + Baythroid XL 10 oz/A 2 oz/A 0.00 0.00 b 0.25 b 0.25 c 0.00 b 0.00 b 0.50 b 0.50 b 98.9 11 Cobalt 19 oz/A 0.25 0.50 b 0.25 b 1.00 c 0.00 b 1.75 b 2.50 b 4.25 b 92.3 12 Untreated 4.75 12.75 a 18.00 a 35.50 a 4.00 a 12.25 a 16.50 a 32.75 a --- LSD NS 3.42 2.35 8.07 0.92 2.07 2.59 3.83 --- 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:
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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
Page 95 and 96: Table 46. Stand counts and yield, P
Page 97 and 98: Table 48. Mean number of thrips per
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: Table 73. Mean number of brown marm
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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