Stethorus punctum1 and Pest-Population Responses to Pesticide Treatments on Apple Trees2

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In 1970, 1971, and 1972, 32 pesticide treatments were tested for their effect on the predatory coccinellid Stethorus punctum (LeConte) and apple pests. Outstanding treatments with commercially satisfactory effectiveness on lepidopterous pests and only slight effect on S. punctum were: 0.0625 lb AI dinocap + 0.125 lb AI azinphosmethyl + 1.34l lb AI lead arsenate/100 gal; the same amounts of dinocap and azinphosmethyl + 0.125 AI Imidan® (0,0- dimethyl S-phthalimidomethyl phosphorodithioate)/100 gal; and the same amounts of dinocap and azinphosmethyl + 0.125 lb AI phosalone/100 gal. The last-mentioned treatment was more effective than the former 2 treatments on the white apple leafhopper, Typhlocyba pomaria McAtee. These 3 treatments demonstrate the dinocap + S. punctum interaction with the European red mite, Panonychus ulmi (Koch). Phosvel® (0-(4-bromo-2,5-dichloropheynl) 0- methyl phenylphosphonothioate) at 1 lb AI/100 gal was effective on the lepidopterous pests, and at 0.5 lb AI/acre it is effective on the white apple leafhopper. At these rates, Phosvel is only slightly toxic to S. punctum. Phosvel was not effective on the apple aphid, Aphis pomi De Geer. Hercules 16801 (Phenyl N-dimethoxyphosphinodithioacethyl N-methylcarbamate) was more effective on the lepidopterous pests at 1 lb AI/100 gal than at 0.5 lb AI. It was not effective on the apple aphid or the white apple leafhopper, and it had low toxicity to S. punctum.

Document Type: Research Article

Publication date: October 1, 1973

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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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