Interface Between Citrus Rust Mite (Acari: Eriophyidae) and Dicofol: Implications for Resistance Management

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Laboratory and field studies were conducted to characterize the interface between citrus rust mite, Phyllocoptruta oleivora (Ashmead), and the acaricide dicofol. Direct and residual (continuous and discontinuous residues) contacts of dicofol on susceptible (S) and dicofol-resistant (R) strains of citrus rust mite were evaluated. The decay in biological activity of different formulations of dicofol was also measured with both strains. Differences between S and R strains were less pronounced in direct contact than residual contact with dicofol. When dicofol was used at high concentrations in residual bioassays (500-1,280 µg [AI]/ml of water [ppm]), the expression of resistance was very poor on fresh residues of dicofol. However, as residues decayed, we observed substantially greater mortality of the S strain than the R strain. Field studies showed that dicofol on citrus fruits becomes biologically inactive to citrus rust mite relatively fast after its application (concentration of 1,280 ppm [AI]). Both Sand R strains survived totally when transferred to a 6-d residue. The formulation of dicofol had an significant effect on the rate of decay in biological activity. Differences in the rate of decay observed in bioassays were consistent with the field performance of dicofol in controlling citrus rust mite.

Document Type: Research Article

Publication date: October 1, 1995

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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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