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Evaluation of Selected Insecticides for Control of Diamondback Moth and Cabbage Looper in Cabbage in Central Florida with Observations on Insecticide Resistance in the Diamondback Moth

Gary L. Leibee and Kenneth E. Savage
The Florida Entomologist
Vol. 75, No. 4 (Dec., 1992), pp. 585-591
DOI: 10.2307/3496140
Stable URL: http://www.jstor.org/stable/3496140
Page Count: 7
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Evaluation of Selected Insecticides for Control of Diamondback Moth and Cabbage Looper in Cabbage in Central Florida with Observations on Insecticide Resistance in the Diamondback Moth
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Abstract

A field study was conducted to evaluate selected insecticides for the control of P. xylostella and cabbage looper, Trichoplusia ni (Hübner), in cabbage, Brassica oleracea L. (Capitata group). Chlorpyrifos, endosulfan, mevinphos, and Bacillus thuringiensis subsp. kurstaki were considerably more effective at controlling P. xylostella than cypermethrin, permethrin, methomyl, and thiodicarb. Cypermethrin, permethrin, thiodicarb, and endosulfan were the most effective at controlling T. ni. Mixtures of two insecticides improved efficacy apparently due to one component controlling T. ni. and not P. xylostella and the other component controlling P. xylostella and not T. ni. Laboratory examination of selected populations from the field study indicated that poor efficacy of the pyrethroids and carbamates on P. xylostella was probably due to insecticide resistance. /// Se realizo un estudio para evaluar insecticidas selectivos para el control de P. xylostella y del medidor del repollo, Trichoplusia ni (Hubner) en repollo, Brassica oleracea L. (grupo capitata). Chlorpyrifos, endosulfan, mevinphos y Bacillus thuringiensis sbesp. kurstaki fueron considerados mas efectivos al controlar P. xylostella que cypermethrin, permethrin, methomyl y thio-dicarb. Cypermethrin, permethrin, thiodicarb y endosulfan fueron los mas efectivos en controlar T. ni. Las mezclas de 2 insecticidas fueron aparentemente mas eficaces dado que un solo compuesto controla T. ni pero no P. xylostella y el otro compuesto controla P. xylostella y no T. ni. Pruebas de laboratorio indicaron que los bajos resultados obtenidos con los pirethroides y carbamatos en poblaciones de P. xylostella seleccionadas del campo, se debieron probablemente a su resistencia a los insecticidas.

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