Populations of oriental fruit moth and codling moth collected from commercial and abandoned fruit orchards in Pennsylvania were tested for resistance levels to azinphos-methyl, methomyl and esfenvalerate. Adult moths susceptibility was assessed using adult topical bioassays and larval sensitivity was assessed using diet topical bioassays. Both species collected from commercial orchards expressed lower levels of insecticide sensitivities than populations collected from an unsprayed site. Up to six fold differences were observed in adult codling moth populations tested with azinphos-methyl.
Species 1: Lepidoptera Tortricidae Grapholita molesta (Oriental fruit moth)
Species 2: Lepidoptera Tortricidae Cydia pomonella (codling moth)
Keywords: resistance, fruit
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