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Laboratory Evaluation of New Insecticides for Control of Redbacked Cutworm Larvae

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Sixteen insecticides were evaluated as oral toxicants for control of fifth-stage larvae of Euxoa ochrogaster (Guenée). Of eight pyrethroids, six were more toxic than endrin and all were more toxic than chlorpyrifos. Their order of toxicity was deltamethrin > FMC 26021 [(5-benzyl-3-furyl) methyl(+)-cis-2,2-dimethyl-3-(2-methyl-1-propenyl) cyclopropanecarboxylate] > permethrin > AC 222705 [(±) cyano(3-phenoxyphenol) methyl(±)-4-(difluromethoxy)-α-(1-methylethyl)-benzeneacetate] = cypermethrin > fenpropanate > endrin > fenvalerate > FMC 18739 [(5-benzyl-3-furyl) methyl(+)-trans-2,2-dimethyl-3-(2-methyl-1-propenyl) cycloyropanecarboxylate] > chlorpynfos. Deltamethrin was 13- and 29-fold more toxic than endrin and chlorpyrifos, respectively, and six other organophosphorus insecticides included in these tests varied from one-third to one-tenth as toxic as endrin.

The pyrethroids were 1.4- to 6.6-fold more toxic as contact poisons, and all were more toxic than the standards, with deltamethrin 50- and 166-fold more toxic than endrin and chlorpyrifos, respectively.

In greenhouse tests with mature sixth-stage larvae, deltamethrin gave the most effective control at 0.07 kg/ha. Permethrin gave better control as a foliar spray than when applied to bare soil. Cypermethrin and fenvalerate were less effective and would require rates in excess of 0.14 kg/ha. Endrin at 0.28 kg/ha gave equivalent control as a foliar or bare-soil treatment, whereas chlorpyrifos at 0.56 kg/ha was less effective and was unsatisfactory when applied to bare soil.

Document Type: Research Article

Publication date: October 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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