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Control of lesser grain borer (Coleoptera: Bostrichidae) with chlorpyrifos-methyl, bioresmethrin, and resmethrin: effect of chlorpyrifos-methyl resistance and environmental degradation
- Arthur, F.H.
- Journal of economic entomology 1992 v.85 no.4 pp. 1471-1475
- wheat, Rhyzopertha dominica, insect control, bioresmethrin, chlorpyrifos-methyl, resmethrin, environmental degradation, insecticide resistance, Georgia
- Soft red winter wheat treated with 6 ppm chlorpyrifos-methyl, 2 and 5 ppm resmethrin, and 2 and 5 ppm bioresmethrin was stored under ambient conditions for 10 mo. Six field strains of lesser grain borer, Rhyzopertha dominica (F.), with chlorpyrifosmethyl resistance frequencies of 21-100% and a susceptible laboratory strain were confined on the treated wheat at regular intervals during storage. Three highly resistant strains were not controlled by the chlorpyrifos-methyl residues. Survival in the remaining three field strains and the laboratory strain increased as the storage interval increased. Chlorpyrifos-methyl resistance frequencies were correlated with residual mortality only immediately after insecticide application. Residues from the bioresmethrin and resmethrin applications controlled all six field strains for 10 mo.