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Comparative Toxicities of Several Insecticides to an Insect Predator, a Non pest Prey Species, and a Pest Prey Species

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We determined that certain insecticides registered for use on alfalfa may be useful in reducing population levels of a pest, the potato leafhopper, Empoasca fabae (Harris), while conserving a predator, Reduvialus americoferus (Carayon). This pattern of effectiveness may occur through relatively reduced toxicity to the predator and through reduced toxicity to a nonpest alternate prey in alfalfa grown for hay, the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois). Toxicities of methidathion, azinphosmethyl, carbofuran, methomyl, carbaryl, and malathion were determined for adults of the three insect species. LC50s for all six insecticides were higher for R. americoferus than for potato leafhoppers; in all but one case, LC50 for tarnished plant bugs were intermediate. Selectivity ratios for R. americoferus over potato leafhopper were highest for azinphosmethyl and lowest for methomyl.

Document Type: Research Article

Publication date: August 1, 1983

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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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