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Selection of the Western Predatory Mite~ Metaseiulus occidentalis (Acari: Phytoseiidae), for Resistance to Abamectin

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A heterogeneous colony of Metaseiulus occidentalis (Nesbitt) was selected 20 times with increasing concentrations of abamectin. Selection yielded a gradual and modest shift in concentration-mortality lines. The resistance obtained, a 3.8-fold increase at LC50 not only resulted in an increased rate of survival of adult females but resulted in an increase in the number of eggs the surviving females produced. The diversity of resistances in this predator (to organophosphates, carbamates, pyrethroids, sulfur, and abamectin) iscomparable with that of many pest arthropods. Availability of an abamectin-resistant strain could be of practical value in integrated pest management programs if the resistant strain is released, established, and is efficacious in deciduous orchards and vineyards.

Document Type: Research Article

Publication date: February 1, 1989

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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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