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Cyhexatin and Fenbutatin-Oxide Resistance in Pacific Spider Mite (Acari: Tetranychidae): Stability and Mode of Inheritance

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The Pacific spider mite, Tetranychus pacificus McGregor, collected from California almond orchards during 1984 and 1985, was tested with cyhexatin and fenbutatin-oxide to determine whether resistance (R) to these acaricides was present. A cyhexatinresistant colony was selected in the greenhouse with cyhexatin for 15 mo to obtain a pure colony for genetic analysis. Mode-of-inheritance data were consistent with a model in which cyhexatin resistance in this colony is primarily determined by a major semi recessive gene. A flowable formulation of cyhexatin was more toxic to both R and susceptible (S) strains than was the wettable powder formulation. Larvae of the Rand 5 strains exhibited survival rates similar to those of adults. Concentration/mortality lines for both fenbutatin-oxide and cyhexatin were obtained for both R and S strains; results were consistent with the hypothesis that cyhexatin resistance confers fenbutatin-oxide resistance in this population. Greenhouse populations held for 9 mo without selection with cyhexatin retained their original resistance levels, as indicated by the percent survival of colonies initiated from RR, SR, RS, and SS females. Negative fitness did not appear to be associated with the resistance allele under these conditions.

Document Type: Research Article

Publication date: February 1, 1988

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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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