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EFFICACY OF SELECTED TRANSGENIC CORN TRAITS AGAINST CORN EARWORM ON CORN, 2010

EFFICACY OF SELECTED TRANSGENIC CORN TRAITS AGAINST CORN EARWORM ON CORN, 2010 Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F25 F25 Corn: Zea Mays, ‘BT’ Lucas N. Owen Department of Entomology and Plant Pathology Mississippi State University 121 Clay Lyle Building, Box 9775 Mississippi State, MS 39762 Phone: (662) 325-3195 Fax: (662) 325-8837 E-mail: lno9@msstate.edu Angus L. Catchot E-mail: acatchot@entomology.msstate.edu Brian P. Adams E-mail: bpa31@msstate.edu William S. Scott Email: wss41@msstate.edu Wes McPherson Email: jwm177@msstate.edu Dung Bao Email: db3@msstate.edu Corn earworm: Helicoverpa zea (Boddie) Corn hybrids were planted on a silt loam soil in Starkville, MS on 12 Apr to evaluate the differences in traits against corn ear worm damage and yield. Plot size was 4 rows by 30 feet long planted on 38 inch centers. Statistical design was a randomized complete block with 4 replications. Estimates of corn earworm densities were determined by shucking back corn ears at corn phonological growth stage R4 and R6. A 20 ear sample from the center two rows of each plot was taken and damaged kernels and number of larvae was recorded for each ear, respectively. Plots were harvested on 3 Sep, and yields were recorded in bushels per acre. Data were analyzed with ANOVA and means were separated using a Fisher’s Protected LSD (P ≤ 0.05). Hybrids with the GEN traits had fewer damaged kernels and larvae present at each sample date compared to all other hybrids in the experiment. All hybrids with BT (Bacillus thuringiensis) yielded higher than the non-BT hybrids tested. Table 1. Average Corn Earworm larvae and damage kernels per ear a b b Hybrid Treatment/ formulation Larvae 6/28 Larvae 7/9 DK 6/28 DK 7/9 Yield bu/ac C33D49 RRH 2.0a 0.2b 13.0c 15.7de 183.8a CP1615HR RRH 1.1bc 0.2b 8.7d 15.5de 185.4a C33D47 RR 1.0bcd 0.1b 13.6c 17.8cd 168.2ab DKC61-65 GEN 0.2e 01.b 1.0e 5.8g 176.7ab DKC61-36 RR 1.3bc 01.b 32.5a 24.8ab 151.3bc DKC66-94 RR 1.3bc 01.b 28.9ab 20.8bc 137.5c DKC66-96 GEN 0.3e 0.4a 1.9e 11.8ef 172.8ab DKC67-21 GEN 0.5de 0.5a 2.1e 12ef 169.3ab DKC67-22 RR 1.4b 0.2b 25.1b 27.3a 158.1bc P1615R RR 0.8cde 0.0b 14.4c 10.3f 139.8c LSD (0.05) 0.56 0.17 3.97 4.10 25.44 Means within a column sharing the same letter are not significantly different (LSD; P > 0.05). RRH, Round-up with Helculex; RR, Round-up; GEN, YieldGard VT Triple Pro DK= Damaged Kernels http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF SELECTED TRANSGENIC CORN TRAITS AGAINST CORN EARWORM ON CORN, 2010

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Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F25 F25 Corn: Zea Mays, ‘BT’ Lucas N. Owen Department of Entomology and Plant Pathology Mississippi State University 121 Clay Lyle Building, Box 9775 Mississippi State, MS 39762 Phone: (662) 325-3195 Fax: (662) 325-8837 E-mail: lno9@msstate.edu Angus L. Catchot E-mail: acatchot@entomology.msstate.edu Brian P. Adams E-mail: bpa31@msstate.edu William S. Scott Email: wss41@msstate.edu Wes McPherson Email: jwm177@msstate.edu Dung Bao Email: db3@msstate.edu Corn earworm: Helicoverpa zea (Boddie) Corn hybrids were planted on a silt loam soil in Starkville, MS on 12 Apr to evaluate the differences in traits against corn ear worm damage and yield. Plot size was 4 rows by 30 feet long planted on 38 inch centers. Statistical design was a randomized complete block with 4 replications. Estimates of corn earworm densities were determined by shucking back corn ears at corn phonological growth stage R4 and R6. A 20 ear sample from the center two rows of each plot was taken and damaged kernels and number of larvae was recorded for each ear, respectively. Plots were harvested on 3 Sep, and yields were recorded in bushels per acre. Data were analyzed with ANOVA and means were separated using a Fisher’s Protected LSD (P ≤ 0.05). Hybrids with the GEN traits had fewer damaged kernels and larvae present at each sample date compared to all other hybrids in the experiment. All hybrids with BT (Bacillus thuringiensis) yielded higher than the non-BT hybrids tested. Table 1. Average Corn Earworm larvae and damage kernels per ear a b b Hybrid Treatment/ formulation Larvae 6/28 Larvae 7/9 DK 6/28 DK 7/9 Yield bu/ac C33D49 RRH 2.0a 0.2b 13.0c 15.7de 183.8a CP1615HR RRH 1.1bc 0.2b 8.7d 15.5de 185.4a C33D47 RR 1.0bcd 0.1b 13.6c 17.8cd 168.2ab DKC61-65 GEN 0.2e 01.b 1.0e 5.8g 176.7ab DKC61-36 RR 1.3bc 01.b 32.5a 24.8ab 151.3bc DKC66-94 RR 1.3bc 01.b 28.9ab 20.8bc 137.5c DKC66-96 GEN 0.3e 0.4a 1.9e 11.8ef 172.8ab DKC67-21 GEN 0.5de 0.5a 2.1e 12ef 169.3ab DKC67-22 RR 1.4b 0.2b 25.1b 27.3a 158.1bc P1615R RR 0.8cde 0.0b 14.4c 10.3f 139.8c LSD (0.05) 0.56 0.17 3.97 4.10 25.44 Means within a column sharing the same letter are not significantly different (LSD; P > 0.05). RRH, Round-up with Helculex; RR, Round-up; GEN, YieldGard VT Triple Pro DK= Damaged Kernels

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2011

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