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Following widespread reports of control failures of the diamondback moth, Plutella xylostella (L.), in North America during 1987, a cooperative project was established in 1988-1989 in which 41 populations from 19 states within the United States, Mexico, Canada, and Belize were evaluated for resistance to three commonly used insecticides representing three major classes of insecticides (pyrethroids, carbamates, and organophosphates). The extent and geographic distribution of resistance to methomyl, permethrin, and methamidophos in North American populations was determined as a first step in developing resistance management strategies. Widespread resistance was confirmed to all three insecticides. Resistance was generally highest in populations that originated from the southern states (Texas, Florida, Georgia, and North Carolina), but scattered populations with high levels of resistance also were detected in northern states (New York, New Hampshire, New Jersey, Ohio, Indiana, Michigan, and Wisconsin). Highest levels of resistance were detected for methomyl, intermediate levels were detected to permethrin, and methamidophos had the lowest levels of resistance. For each population we observed a significant relationship between the log of the LC50 of one insecticide to that of another. Such significant relationships may be the result of cross-resistance between these classes of insecticides or simply may be the result of sequential development of resistance to each insecticide. Where data were available for field performance and laboratory bioassays on populations from certain regions, results with the two methods agreed. Discriminating doses to identify resistant populations are proposed.
Document Type: Research Article
Publication date: February 1, 1993
More about this publication?
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.