Insecticide Resistance of Diamondback Moth (Lepidoptera: Plutellidae) in North America

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