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EVALUATION OF SELECTED FOLIAR INSECTICIDES FOR CONTROL OF CORN EARWORM IN 15-INCH ROW SPACED SOYBEAN, 2011

EVALUATION OF SELECTED FOLIAR INSECTICIDES FOR CONTROL OF CORN EARWORM IN 15-INCH ROW SPACED... Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F77 (F77) SOYBEAN: Glycine max (L.) Merrill, ‘MFS-541’ EVALUATION OF SELECTED FOLIAR INSECTICIDES FOR CONTROL OF CORN EARWORM IN 15-INCH ROW SPACED SOYBEAN, 2011 D.A. Herbert, Jr., S. Malone, M. Arrington, D. Owens, & J. Samler Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450 Fax: (757) 657-9333 Email: herbert@vt.edu Corn earworm (CEW): Helicoverpa zea (Boddie) A test was conducted to determine efficacy of foliar-applied insecticides against CEW, a major late-season pest in Virginia soybean. ‘MFS-541’ soybean was planted on 17 Jun 2011 at the B. Speight farm in Suffolk, VA, using 15-inch row spacing. A RCBD was used with 4 replicates; plots were 11.25 ft by 40 ft. Treatments were broadcast (BC) on 12 Aug with a CO -pressurized backpack sprayer at 14.7 gpa and 42 psi through six D2-13 nozzles on a 6-ft full-coverage spray boom. Efficacy against CEW was determined at 3 and 6 days after treatment (DAT) by taking 10 sweeps/plot with a standard 15-inch diameter sweep net (covering 2 rows per sweep) and recording the number of small, medium, large, and total larvae. Data were analyzed using ANOVA and LSD statistical procedures. Pre-treatment counts on 12 Aug indicated 6.0 small, 12.5 medium, and 8.5 large larvae per 15 sweeps (n=2). Mandibular dissection of 25 larvae indicated 96% CEW and 4% Heliothis virescens (F.) (tobacco budworm) on 12 Aug, and 100% CEW on 18 Aug. All treatments had significantly lower total CEW larvae than the untreated check at both 3 and 6 DAT, with differences between treatments at 3 DAT. 3 DAT 6 DAT Treatment/ Rate/ formulation oz acre Small Medium Large Total Small Medium Large Total Steward 1.25SC 6.0 6.25 1.50b 1.50b 9.25b 0.00b 1.25b 1.00b 2.25b Steward 1.25SC 10.0 0.00 0.50b 0.00b 0.50c 0.00b 0.50b 0.00b 0.50b Steward 1.25SC 6.0 0.00 0.00b 0.50b 0.50c 0.00b 0.75b 1.00b 1.75b + Baythroid XL 1E 2.0 Belt 4SC 2 0.75 3.00b 1.00b 4.75bc 0.25b 0.25b 1.00b 1.50b Belt 4SC 3 0.25 3.25b 1.25b 4.75bc 0.00b 0.00b 0.50b 0.50b Belt 4SC 2 0.25 0.25b 0.00b 0.50c 0.00b 0.25b 0.25b 0.50b + Baythroid XL 1E 2 Baythroid XL 1E 2.8 0.25 0.50b 0.00b 0.75c 0.00b 0.00b 0.50b 0.50b + Orthene 97PE 8.0 Larvin 3.2SC 10.0 1.25 1.25b 0.25b 2.75bc 0.00b 0.00b 0.50b 0.50b Larvin 3.2SC 16.0 0.00 0.25b 0.25b 0.50c 0.00b 0.00b 1.25b 1.25b Larvin 3.2SC 10.0 0.00 0.00b 0.25b 0.25c 0.00b 0.00b 0.50b 0.50b + Baythroid XL 1E 2.0 Cobalt 2.545E 19.0 0.25 0.50b 0.25b 1.00c 0.00b 1.75b 2.50b 4.25b Check -- 4.75 12.75a 18.00a 35.50a 4.00a 12.25a 16.50a 32.75a 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). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SELECTED FOLIAR INSECTICIDES FOR CONTROL OF CORN EARWORM IN 15-INCH ROW SPACED SOYBEAN, 2011

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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F77 (F77) SOYBEAN: Glycine max (L.) Merrill, ‘MFS-541’ EVALUATION OF SELECTED FOLIAR INSECTICIDES FOR CONTROL OF CORN EARWORM IN 15-INCH ROW SPACED SOYBEAN, 2011 D.A. Herbert, Jr., S. Malone, M. Arrington, D. Owens, & J. Samler Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450 Fax: (757) 657-9333 Email: herbert@vt.edu Corn earworm (CEW): Helicoverpa zea (Boddie) A test was conducted to determine efficacy of foliar-applied insecticides against CEW, a major late-season pest in Virginia soybean. ‘MFS-541’ soybean was planted on 17 Jun 2011 at the B. Speight farm in Suffolk, VA, using 15-inch row spacing. A RCBD was used with 4 replicates; plots were 11.25 ft by 40 ft. Treatments were broadcast (BC) on 12 Aug with a CO -pressurized backpack sprayer at 14.7 gpa and 42 psi through six D2-13 nozzles on a 6-ft full-coverage spray boom. Efficacy against CEW was determined at 3 and 6 days after treatment (DAT) by taking 10 sweeps/plot with a standard 15-inch diameter sweep net (covering 2 rows per sweep) and recording the number of small, medium, large, and total larvae. Data were analyzed using ANOVA and LSD statistical procedures. Pre-treatment counts on 12 Aug indicated 6.0 small, 12.5 medium, and 8.5 large larvae per 15 sweeps (n=2). Mandibular dissection of 25 larvae indicated 96% CEW and 4% Heliothis virescens (F.) (tobacco budworm) on 12 Aug, and 100% CEW on 18 Aug. All treatments had significantly lower total CEW larvae than the untreated check at both 3 and 6 DAT, with differences between treatments at 3 DAT. 3 DAT 6 DAT Treatment/ Rate/ formulation oz acre Small Medium Large Total Small Medium Large Total Steward 1.25SC 6.0 6.25 1.50b 1.50b 9.25b 0.00b 1.25b 1.00b 2.25b Steward 1.25SC 10.0 0.00 0.50b 0.00b 0.50c 0.00b 0.50b 0.00b 0.50b Steward 1.25SC 6.0 0.00 0.00b 0.50b 0.50c 0.00b 0.75b 1.00b 1.75b + Baythroid XL 1E 2.0 Belt 4SC 2 0.75 3.00b 1.00b 4.75bc 0.25b 0.25b 1.00b 1.50b Belt 4SC 3 0.25 3.25b 1.25b 4.75bc 0.00b 0.00b 0.50b 0.50b Belt 4SC 2 0.25 0.25b 0.00b 0.50c 0.00b 0.25b 0.25b 0.50b + Baythroid XL 1E 2 Baythroid XL 1E 2.8 0.25 0.50b 0.00b 0.75c 0.00b 0.00b 0.50b 0.50b + Orthene 97PE 8.0 Larvin 3.2SC 10.0 1.25 1.25b 0.25b 2.75bc 0.00b 0.00b 0.50b 0.50b Larvin 3.2SC 16.0 0.00 0.25b 0.25b 0.50c 0.00b 0.00b 1.25b 1.25b Larvin 3.2SC 10.0 0.00 0.00b 0.25b 0.25c 0.00b 0.00b 0.50b 0.50b + Baythroid XL 1E 2.0 Cobalt 2.545E 19.0 0.25 0.50b 0.25b 1.00c 0.00b 1.75b 2.50b 4.25b Check -- 4.75 12.75a 18.00a 35.50a 4.00a 12.25a 16.50a 32.75a 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).

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2012

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