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Susceptibility status of boll weevils from Louisiana to eleven insecticides

Susceptibility status of boll weevils from Louisiana to eleven insecticides

Southwestern Entomologist 21(1): 59-74

Topical bioassays of 11 insecticides were conducted with the R. T. Gast Insect Rearing laboratory colony (GAST-LAB) and 22 field collections of boll weevils, Anthonomus grandis grandis Boheman, from 11 parishes in Louisiana. The order of toxicity of the insecticides tested against the GAST-LAB colony from most to least toxic was cyfluthrin gt zetacypermethrin gt fipronil ((+-)-5-amino-1-(2, 6-dichloro-alpha,alpha,alpha-trifluoro-p-tolyl)-4-tri-fluoromethylsulfinylpyrazole-3-carbonitrile) gt deltamethrin gt azinphosmethyl gt cypermethrin gt methyl parathion gt Pirate (4-bromo-2-(4-chlorophenyl)-1(ethoxymethyl)-5-(trifluoromethyl)-pyrrole-3-carbonitrile) gt oxamyl gt endosulfan gt malathion. There was no conclusive evidence of resistance to any of the 11 insecticides bioassayed against field-collected boll weevils, although LD-50'S for cypermethrin, cyfluthrin, malathion, and oxamyl were highly variable. The LD-50 values for deltamethrin, endosulfan, fipronil, oxamyl, Pirate, and zeta-cypermethrin will serve as baseline data for future studies.

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