Field Reversion of Organotin Resistance in the Twospotted Spider Mite (Acari: Tetranychidae) Following Relaxation of Selection Pressure

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Abstract:

Cyhexatin efficacy was improved when organotin selection pressure to a resistant population of Tetranychus urticae Koch from southern Oregon pear was reduced by substitution of an acaricide to which the mites were not cross-resistant. Abamectin (avermectin Bl) was applied in 1984 and 1985 to a block in an orchard shown to have cyhexatin resistant mites in 1983. In 1986 and 1987, the block treated with abamectin (reversion block) and a block that had received cyhexatin in 1984 and 1985 (standard treatment block) were divided into subplots and treated with cyhexatin. Better efficacy was achieved with cyhexatin in 1986 and 1987 in the block treated with abamectin than the block treated with cyhexatin. These results suggest an operational mechanism by which organotin resistance in T. urticae.can be managed.

Document Type: Research Article

Publication date: December 1, 1988

More about this publication?
  • 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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