Citrus Thrips (Thysanoptera: Thripidae) Pesticide Resistance in the Coachella and San Joaquin Valleys of California

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Citrus thrips (Scirtothrips citri (Moulton)) resistance to dimethoate, or formetanate, or both was evaluated in 13 commercial citrus groves in the Coachella and San Joaquin Valleys of California in 1986. Dimethoate resistance was apparent at one site in the Coachella Valley (30.o-fold at the LC50) and at all San Joaquin Valley sites (21.5-90.3-fold at the LC50). Increased levels of formetanate use appeared to be correlated with increased resistance (up to 3l.0-fold at the LC50)to this chemical. Intensity and frequency of dimethoate and formetanate resistance were higher and more widespread in the San Joaquin Valley than in the Coachella Valley. These results are discussed with respect to general patterns of citrus thrips resistance and their implications to resistance management.

Document Type: Research Article

Publication date: April 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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