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EVALUATION OF SELECTED INSECTICIDE TREATMENTS AGAINST HELIOTHINES ON COTTON, 2002

EVALUATION OF SELECTED INSECTICIDE TREATMENTS AGAINST HELIOTHINES ON COTTON, 2002 (F45) COTTON: Gossypium hirsutum L. 'SureGrow 747' EVALUATION OF SELECTED INSECTICIDE TREATMENTS AGAINST HELIOTHINES ON COTTON, 2002 R. H. Gable LSU AgCenter Northeast Research Station, Macon Ridge Location Winnsboro, LA 71295 Tel: (318) 435-2157 Fax: (318) 435-2133 rgable@agctr.lsu.edu K. Emfinger B. R. Leonard M. M. Willrich LSU AgCenter Department of Entomology Baton Rouge, LA 70803 Bollworm (BW): Helicoverpa zea (Boddie) Tobacco budworm (TBW): Heliothis virescens (F.) Cotton seed were planted 4 Jun in plots consisting of four rows (centered on 40 inch) x 50 ft. Treatments were arranged in a RCB design and replicated four times. Insecticides were applied with a John Deere 6000 hi-clearance sprayer and CO charged system calibrated to deliver 6 gpa through Teejet TX-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 2, 6, and 9 Aug. Treatments were evaluated by examining 100 flower buds (squares) per plot on 6, 9, and 13 Aug, for evidence of Bollworm (BW) and Tobacco budworm (TBW) damage and squares infested with larvae. The test received 1.40 inch of rain between the first insecticide application (2 Aug) and the last sampling date (13 Aug). Data were analyzed with ANOVA, and means were separated according to DMRT. Larvae in the plots consisted of a mixed population of BW and TBW, but BW represented the dominant (>75%) species during the test. Plots treated with Steward, S-1812 + Asana, or S-1812 + Orthene had significantly fewer damaged squares compared to the non-treated plots on 6 Aug. All insecticide treatments, except Orthene, significantly reduced the number of damaged squares compared to that in the non-treated control on 9 Aug, 13 Aug, and the test mean. On 6 Aug, none of the treated plots had significantly fewer larvae compared to the non-treated plots. Plots treated with Orthene, had more larvae than that in all other treated plots. All of the insecticide treatments, except Orthene, significantly reduced mean numbers of larvae compared to the non-treated control on 9 Aug and for the test mean. All insecticide treated plots had significantly fewer larvae than the non-treated control on 13 Aug. No phytotoxicity from any insecticide was observed in this test. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SELECTED INSECTICIDE TREATMENTS AGAINST HELIOTHINES ON COTTON, 2002

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Oxford University Press
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10.1093/amt/28.1.F45
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Abstract

(F45) COTTON: Gossypium hirsutum L. 'SureGrow 747' EVALUATION OF SELECTED INSECTICIDE TREATMENTS AGAINST HELIOTHINES ON COTTON, 2002 R. H. Gable LSU AgCenter Northeast Research Station, Macon Ridge Location Winnsboro, LA 71295 Tel: (318) 435-2157 Fax: (318) 435-2133 rgable@agctr.lsu.edu K. Emfinger B. R. Leonard M. M. Willrich LSU AgCenter Department of Entomology Baton Rouge, LA 70803 Bollworm (BW): Helicoverpa zea (Boddie) Tobacco budworm (TBW): Heliothis virescens (F.) Cotton seed were planted 4 Jun in plots consisting of four rows (centered on 40 inch) x 50 ft. Treatments were arranged in a RCB design and replicated four times. Insecticides were applied with a John Deere 6000 hi-clearance sprayer and CO charged system calibrated to deliver 6 gpa through Teejet TX-8 hollow cone nozzles (2/row) at 46 psi. Insecticides were applied on 2, 6, and 9 Aug. Treatments were evaluated by examining 100 flower buds (squares) per plot on 6, 9, and 13 Aug, for evidence of Bollworm (BW) and Tobacco budworm (TBW) damage and squares infested with larvae. The test received 1.40 inch of rain between the first insecticide application (2 Aug) and the last sampling date (13 Aug). Data were analyzed with ANOVA, and means were separated according to DMRT. Larvae in the plots consisted of a mixed population of BW and TBW, but BW represented the dominant (>75%) species during the test. Plots treated with Steward, S-1812 + Asana, or S-1812 + Orthene had significantly fewer damaged squares compared to the non-treated plots on 6 Aug. All insecticide treatments, except Orthene, significantly reduced the number of damaged squares compared to that in the non-treated control on 9 Aug, 13 Aug, and the test mean. On 6 Aug, none of the treated plots had significantly fewer larvae compared to the non-treated plots. Plots treated with Orthene, had more larvae than that in all other treated plots. All of the insecticide treatments, except Orthene, significantly reduced mean numbers of larvae compared to the non-treated control on 9 Aug and for the test mean. All insecticide treated plots had significantly fewer larvae than the non-treated control on 13 Aug. No phytotoxicity from any insecticide was observed in this test.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2003

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