Laboratory, Glasshouse, and Field Studies of Artificially Selected Carbaryl Resistance in Metaseiulus occidentalis

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Laboratory and glasshouse tests were conducted to assess the vigor and reproductive compatibilities of two laboratory-selected carbaryl resistant strains of a predatory mite, Metaseiulus occidentalis (Nesbitt). Traits evaluated included development time, fecundity, sex ratio, mating compatibilities and competition, diapause, persistence of the carbaryl resistance characteristic, and the capability to control spider mite populations under carbaryl sprayed and unsprayed conditions. The resistant strains did not differ significantly from the susceptible strains tested in the absence of carbaryl treatment.

The resistant strains were released in almond orchards where they survived arbaryl applications, controlled spider mite populations, and overwintered. This is believed to be the first time that the field effectiveness of a biological control agent has been improved through artificial selection.

Document Type: Research Article

Publication date: April 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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