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EFFICACY OF VARIOUS INSECTICIDES AGAINST BOLLWORMS ON COTTON, 2002

EFFICACY OF VARIOUS INSECTICIDES AGAINST BOLLWORMS ON COTTON, 2002 (F40) COTTON: Gossypium hurtsutum L., 'Fibermax 989 RR' J. S. Bacheler Dept. of Entomology North Carolina State Univ. Tel: (919) 515- 8877 D. W. Mott Bollworm (BW): Helicoverpa zea (Boddie) Cotton was planted no-till on 28 May into a Goldsboro sandy loam soil in 38-inch rows in southeastern NC near Richlands. The fertility and herbicide programs followed extension recommendations for cotton in this region. Plot size was 40 ft x 4 rows with four replications arranged in a RCBD. The initial spray was on Jul st nd 23 at a threshold of approximately 15 eggs/100 terminals and approximately 3% 1 and 2 instar bollworm (BW). Insecticide applications were applied on 23 and 29 Jul with a backpack-type, CO -pressurized sprayer calibrated to deliver 8.0 gpa at 50 psi with a single TX-8 Spray Systems nozzle 18 inches over the row. Twenty five bolls/plot were examined for damage and live BW, fall armyworms, and European corn borers on 15 Aug. On this date 80 late instar BW larvae were taken from the two outside rows of the check, and returned for BW/tobacco budworm identification. Plots were harvested from the middle two rows with a two row John Deere picker on 8 Nov. Seed cotton yields were converted to lint cotton/acre using 40% gin turnout. All data were entered into Gylling's ARM 6.2 software and analyzed via ANOVA and LSD. nd At the 15 Aug sampling date, taken 6 d following the 2 application, all products showed a significant reduction in boll damage from BW and overall boll damage (BW + Fall armyworms). Tracer showed higher BW damage to bolls than Fury, F0570, and Baythroid. Although somewhat variable, all treatments yielded significantly more that the check. However, very few significant yield differences were found between treatments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF VARIOUS INSECTICIDES AGAINST BOLLWORMS ON COTTON, 2002

Arthropod Management Tests , Volume 28 (1) – Jan 1, 2003

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/28.1.F40
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Abstract

(F40) COTTON: Gossypium hurtsutum L., 'Fibermax 989 RR' J. S. Bacheler Dept. of Entomology North Carolina State Univ. Tel: (919) 515- 8877 D. W. Mott Bollworm (BW): Helicoverpa zea (Boddie) Cotton was planted no-till on 28 May into a Goldsboro sandy loam soil in 38-inch rows in southeastern NC near Richlands. The fertility and herbicide programs followed extension recommendations for cotton in this region. Plot size was 40 ft x 4 rows with four replications arranged in a RCBD. The initial spray was on Jul st nd 23 at a threshold of approximately 15 eggs/100 terminals and approximately 3% 1 and 2 instar bollworm (BW). Insecticide applications were applied on 23 and 29 Jul with a backpack-type, CO -pressurized sprayer calibrated to deliver 8.0 gpa at 50 psi with a single TX-8 Spray Systems nozzle 18 inches over the row. Twenty five bolls/plot were examined for damage and live BW, fall armyworms, and European corn borers on 15 Aug. On this date 80 late instar BW larvae were taken from the two outside rows of the check, and returned for BW/tobacco budworm identification. Plots were harvested from the middle two rows with a two row John Deere picker on 8 Nov. Seed cotton yields were converted to lint cotton/acre using 40% gin turnout. All data were entered into Gylling's ARM 6.2 software and analyzed via ANOVA and LSD. nd At the 15 Aug sampling date, taken 6 d following the 2 application, all products showed a significant reduction in boll damage from BW and overall boll damage (BW + Fall armyworms). Tracer showed higher BW damage to bolls than Fury, F0570, and Baythroid. Although somewhat variable, all treatments yielded significantly more that the check. However, very few significant yield differences were found between treatments.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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