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Evaluation of Organophosphorus and Pyrethroid Insecticides for Control of the Pale Western Cutworm

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In comparative oral toxicity tests with 5th-stage larvae of Agrotis orthogonia Morrison, 8 pyrethroids were more toxic than 17 organophosphorus insecticides. Decamethrin was 10 × more toxic than endrin, whereas AC 222705 ((±)-Cyano[3-phenoxyphenyl]methyl(±)-4- [difluromethoxy]-α-[1-methylethyl] benzeneacetate) > cypermethrin > endrin = fenpropanate = permethrin > fenvalerate = FMC 26021 ([5-benzyl-3-furyl]methyl(+)trans-2,2-dimethyl-3-[2-methyl-1-propenyl][cyclopropanecarboxylate]). The organophosphorus insecticides, Bay 77049 (O,O-diethyl-O-[2-quinoxalinyl] phosphorothioate), monocrotophos, chlorpyrifos, and N 2596 (0-ethyl S-[P-chlorophenyl] ethyl phosphorodithioate) were equal in toxicity but were 3–4 × less toxic than endrin. The remaining insecticides were 5–30 × less toxic than endrin.

As contact poisons, the pyrethroids were 4–156 × more toxic than endrin with decamethrin as the most toxic. Chlorpyrifos was equal to endrin but both were 2 and 8 × less toxic, respectively, as contact than as oral poisons whereas the pyrethroids except for AC 222705 and FMC 18739 were 2–3 × more toxic as contact poisons.

In greenhouse tests, cypermethrin, fenvalerate, and permethrin at 0.07 kg/ha were as effective as endrin at 0.28 and chlorpyrifos at 0.56 kg/ha when applied to wheat plants or to bare soil. These pyrethroids at 0.28 kg/ha applied to bare soil gave significantly better control than endrin at 0.28 and chlorpyrifos at 0.56 kg/ha. Leptophos was as effective as chlorpyrifos when applied to wheat plants but was less effective when soil applied. Methamidophos was unsatisfactory at the rates tested.

Document Type: Research Article

Publication date: February 1, 1981

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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