Factors Influencing Pyrethroid Toxicity in Pink Bollworm (Lepidoptera: Gelechiidae): Implications for Resistance Management
Authors: SCHOUEST, JR., LEO P.; MILLER, T. A.
Source: Journal of Economic Entomology, Volume 81, Number 2, April 1988 , pp. 431-436(6)
Publisher: Entomological Society of America
Abstract:Toxicities of fenvalerate and permethrin were measured by three bioassay methods (topical application, vial-discriminating dose, and sticky-trap attracticide) at different temperatures and exposure times on a laboratory strain of adult male pink bollworm, Pectinophora gossypiella (Saunders). Variations in toxicity and slopes of dose response regressions for each bioassay were dependent on the temperature at which the bioassay was performed and the total time of exposure to a concentration. More reliable regression lines were obtained for fenvalerate than for permethrin using similar protocols. Control mortality was lowest for the vial-discriminating dose of the three bioassays. Slope shifts for the vial bioassay indicated that toxicity of permethrin, but not fenvalerate, was independent of temperature. Shifts in slope values of sticky-trap and topical bioassays indicated temperature dependence for both pyrethroids. Based on a discriminating dose, the vial bioassay was a good predictor of possible resistance. Data from the attracticide bioassay fit the probit model well and gave a precise estimate of a discriminating dose. Lower temperatures and longer exposure times gave less heterogeneous probit lines for all methods. The hypothesis of equality was rejected for permethrin and fenvalerate in all three bioassays except for fenvalerate in the vial bioassay at low temperatures and long exposure times. Different LCs from different bioassays indicate that the monitoring bioassay used in resistance management must be chosen carefully.
Document Type: Research Article
Publication date: April 1, 1988
- 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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