Susceptibility status of boll weevils from Louisiana to eleven insecticides

Document Type

Article

Publication Date

3-1-1996

Abstract

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 > zeta-cypermethrin > fipronil [(±)-5-amino-1-(2, 6-dichloro-α, α, α-trifluoro-p-tolyl)-4-tri-fluoromethylsulfinylpyrazole-3-carbonitrile] > deltamethrin > azinphosmethyl > cypermethrin > methyl parathion > Pirate® [4-bromo-2-(4-chlorophenyl)-1-(ethoxymethyl)-5-(trifluoromethyl)-pyrrole-3- carbonitrile] > oxamyl > endosulfan > malathion. There was no conclusive evidence of resistance to any of the 11 insecticides bioassayed against field-collected boll weevils, although LD50's for cypermethrin, cyfluthrin, malathion, and oxamyl were highly variable. The LD50 values for deltamethrin, endosulfan, fipronil, oxamyl, Pirate®, and zeta-cypermethrin will serve as baseline data for future studies.

Publication Source (Journal or Book title)

Southwestern Entomologist

First Page

59

Last Page

74

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