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Toxicity of Avermectin B1 to San Jose Scale (Homoptera: Diaspididae) Crawlers, and Effects on Orchard Mites by Crawler Sprays Compared with Full-season Applications

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Avermectin B1, when applied to the crawler stage of populations of San Jose scale, Quadraspidiotus perniciosus (Comstock), in an orchard, showed the greatest activity against the first generation of Q. perniciosus, even when both generations were subjected to sprays during the crawler stage. A laboratory bioassay in which potato tubers were used as a rearing medium showed that dried residues of avermectin B1 are toxic to Q. perniciosus crawlers. Avermectin B1 also was an effective acaricide for Panonychus ulmi (Koch). Populations of the predatory mite Neoseiulus fallacis (Garman) were not significantly affected by the crawler sprays although avermectin B1 initially lowered predator densities when used in a full-season program.

Document Type: Research Article

Publication date: December 1, 1985

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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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