Laboratory and Field Investigations of Spider Mite (Acari: Tetranychidae) Resistance to the Selective Acaricide Propargite
Authors: Dennehy, T. J.; Granett, J.; Leigh, T. F.; Colvin, A.
Source: Journal of Economic Entomology, Volume 80, Number 3, June 1987 , pp. 565-574(10)
Publisher: Entomological Society of America
Abstract:Evaluations of spider mite, Tetranychus spp., susceptibility to propargite, initiated in response to grower concerns about potential resistance in the field, revealed 0- to 42-fold resistance in Tetranychus urticae Koch in a whole-plant residual bioassay. Surveys of spider mites collected from throughout the San Joaquin Valley in June and August 1984 indicated that propargite-resistant phenotypes exist throughout the San Joaquin Valley; 22 of 32 sites sampled in August contained individuals that survived 1,000 ppm in residual bioassays. However, resistant phenotypes were much less common in June than August; only 3 of 23 sites sampled in June had survivors of 1,000 ppm. The shift in susceptibility of populations during the season was shown to result from intraspecific increases in frequency of resistant phenotypes or interspecific shifts in spider mite species abundance, or both. Although resistant phenotypes of T. urticae and Tetranychus pacificus McGregor were discovered, no propargite-resistant Tetranychus turkestani Ugarov and Nikolski were found. Widely differing susceptibilities to propargite exist both within and between T. urticae and T. pacificus populations. A dicofol-resistant laboratory culture of T. urticae originating from the San Joaquin Valley and maintained under pressure for 2 yr possessed a 26-fold resistance to propargite. Although resistance to propargite was discovered in the laboratory, we did not observe diminished performance of propargite in field trials at a location possessing spider mites with up to 45% survivorship of the discriminating concentration of 1,000 ppm propargite.
Document Type: Research Article
Publication date: June 1, 1987
- 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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