Practitioner-assessable Bioassay for Detection of Dicofol Resistance in Spider Mites (Acari: Tetranychidae)
Authors: Dennehy, T. J.; Grafton-Cardwell, E. E.; Granett, J.; Barbour, K.
Source: Journal of Economic Entomology, Volume 80, Number 5, October 1987 , pp. 998-1003(6)
Publisher: Entomological Society of America
Abstract:An inexpensive, practitioner-assessable (PA) bioassayprocedure for estimating frequency of dicofol-resistant spider mites, Tetranychus spp., was developed in the laboratory and evaluated in San Joaquin Valley cotton fields during 1984–85. PA assays using a discriminating concentration of 56.2 ppm readily distinguished between resistant and susceptible mites. Paired comparisons of susceptibility of spider mites from 23 field locations, as depicted by the PA bioassay and a previously validated but labor-intensive whole-plant-residual bioassay, showed that the PA bioassay can be reliably used to detect fields in which frequency of dicofol resistance is above the critical frequency of 10%. An action threshold of 80% mortality (at the discriminating concentration of 56.2 ppm) is suggested for use with the PA bioassay; dicofol should not be used at locations where mortality in PA assays is <80%. The bioassay provides a tool for taking advantage of the observed instability and limited scope of dicofol resistance in spider mites of cotton.
Document Type: Research Article
Publication date: 1987-10-01
- 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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