Laboratory Evaluation of Several New Insecticides for Control of the Pale Western Cutworm1,2

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Fifty-six insecticdes were evaluated in the laboratory for control of larvae of Agrotis olthogonia Morrison. Endrin was used as the reference standard for the selection of alternates to the organochlorine insecticides. Initial screening tests readily selected possible alternates and indicated that larvae of this species detoxified the carbamate insecticides. American Cyanamid 47031 (cyclic ethylene (diethoxyphosphinyl) dithioimidocarbonate) ; AC-47470 (cyclic propylene (diethoxyphosphinyl) dithioimidocarbonate); Bayer 78182 (O,O-diethyl phosphorothioate, O- ester with (O-chlorophenyl) glyoxylonitrile oxime); DursbanĀ®; (O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate); and trichlorfon were comparable to isobenzan as oral toxic ants but 2-3 times less toxic than endrin.

LD50 and LD95 values were determined for 15 selected compounds to establish comparative oral toxicity levels and baseline toxicity data for larvae of the pale western cutworm. Greenhouse tests indicated that Dursban and AC-47031 at 6 oz per acre (0.42 kg per hectare) gave control comparable to endrin at 4 oz per acre (O.2H kg per hectare) and that trichlorfon was unsatisfactory as a soil treatment. Other insecticides, as indicated by these tests, are worthy of field-trial evaluation for control of this species.

Document Type: Research Article

Publication date: February 1, 1969

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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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