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Susceptibility of the Colorado Potato Beetle in Ontario to Insecticides

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First generation adults of strains of Leptinotarsa decemlineata (Say) collected from 4 locations in southwestern Ontario showed no evidence of resistance to azinphosmethyl, phosmet, methamidophos, carbaryl or carbofuran. Two of the 4 were resistant to endosulfan. Subsequent dosage-mortality studies using 3rd stage larvae of a susceptible and 1 endosulfan-resistant strain indicated the latter also was resistant to aldrin, endrin, and DDT. Relative susceptibility of larvae of the 2 strains to azinphosmethyl, chlorfenvinphos, carbaryl, and carbofuran was similar. Forty insecticides were screened against 3rd stage larvae and adults of the susceptible strain. Of materials presently recommended for use in Ontario carbofuran was the most effective larvicide > endosulfan > azinphosmethyl > carbaryl > phosmet > methamidophos. The experimental insecticides, Shell WL 41706 (alpha-Cyano-3-phenoxybenzyl 2, 2, 3, 3-tetramethylcyclopropane carboxylate), Shell WL 43775 (alpha-Cyano-3-phenoxybenzyl) -2- (4-chlorophenyl) -3-methyl-l-butyrate, chlorfenvinphos, and oxamyl were as or more effective than carbofuran or endosulfan. Endosulfan was the most toxic contact adulticide > carbofuran > azinphosmethyl > phosmet > carbaryl > methamidophos. WL 41706 and WL 43775 were more toxic than endosulfan.

Document Type: Research Article

Publication date: October 1, 1976

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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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