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EVALUATION OF FOLIAR INSECTICIDE TREATMENTS FOR CONTROL OF BOLLWORM AND TOBACCO BUDWORM ON COTTON, 2002.

EVALUATION OF FOLIAR INSECTICIDE TREATMENTS FOR CONTROL OF BOLLWORM AND TOBACCO BUDWORM ON... (F64) COTTON: Gossypium hirsutum L., 'Phytogen 355' EVALUATION OF FOLIAR INSECTICIDE TREATMENTS FOR CONTROL OF BOLLWORM AND TOBACCO BUDWORM ON COTTON, 2002. M. B. Layton Department of Entomology and Plant Pathology Mississippi State University Box 9775 Mississippi State, MS 39762 Tel: (662) 325-2085 Fax: (662)-325-8837 blayton@entomology.msstate.edu J. L. Long Bollworm (BW): Helicoverpa zea (Boddie) Tobacco budworm (TBW): Heliothis virescens (F.) Selected insecticides were evaluated for control of Bollworm (BW) and Tobacco budworm (TBW) in a cotton field located at Mississippi State University. Treatments were replicated four times in a RCB design. Rows were spaced 38 inch apart and each plot was 8 rows wide x 40 ft long. Treatments were applied on 24 Aug using a CO -powered backpack sprayer calibrated to deliver 9.5 gpa total volume at 40 psi through 8001 nozzles spaced 19 inch apart. No adjuvants were used. The crop, which had been mown in early Jul and allowed to re-grow, was in early bloom at this time. Treatments were evaluated at 3 and 6 DAT by visually examining 25 randomly chosen terminals per plot. No rainfall occurred within 24 h of application, but approximately 0.25 inch of rainfall occurred within 48 h. Of 16 larvae collected from untreated plots at 6 DAT, 87.5% were identified as bollworms and 12.5% were identified as TBW. With the exception of the low rate of Denim at 6 DAT, all treatments provided significant reductions in the total number of larvae on both sample dates. However at 6DAT, the total number of larvae exceeded the economic threshold of 4 larvae per 100 plants in all treatments. It is likely that the rainfall had an adverse impact on treatment efficacy. Tracer provided best residual control of small larvae at 6 DAT. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF FOLIAR INSECTICIDE TREATMENTS FOR CONTROL OF BOLLWORM AND TOBACCO BUDWORM 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.F64
Publisher site
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Abstract

(F64) COTTON: Gossypium hirsutum L., 'Phytogen 355' EVALUATION OF FOLIAR INSECTICIDE TREATMENTS FOR CONTROL OF BOLLWORM AND TOBACCO BUDWORM ON COTTON, 2002. M. B. Layton Department of Entomology and Plant Pathology Mississippi State University Box 9775 Mississippi State, MS 39762 Tel: (662) 325-2085 Fax: (662)-325-8837 blayton@entomology.msstate.edu J. L. Long Bollworm (BW): Helicoverpa zea (Boddie) Tobacco budworm (TBW): Heliothis virescens (F.) Selected insecticides were evaluated for control of Bollworm (BW) and Tobacco budworm (TBW) in a cotton field located at Mississippi State University. Treatments were replicated four times in a RCB design. Rows were spaced 38 inch apart and each plot was 8 rows wide x 40 ft long. Treatments were applied on 24 Aug using a CO -powered backpack sprayer calibrated to deliver 9.5 gpa total volume at 40 psi through 8001 nozzles spaced 19 inch apart. No adjuvants were used. The crop, which had been mown in early Jul and allowed to re-grow, was in early bloom at this time. Treatments were evaluated at 3 and 6 DAT by visually examining 25 randomly chosen terminals per plot. No rainfall occurred within 24 h of application, but approximately 0.25 inch of rainfall occurred within 48 h. Of 16 larvae collected from untreated plots at 6 DAT, 87.5% were identified as bollworms and 12.5% were identified as TBW. With the exception of the low rate of Denim at 6 DAT, all treatments provided significant reductions in the total number of larvae on both sample dates. However at 6DAT, the total number of larvae exceeded the economic threshold of 4 larvae per 100 plants in all treatments. It is likely that the rainfall had an adverse impact on treatment efficacy. Tracer provided best residual control of small larvae at 6 DAT.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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