Techniques to Measure Azinphosmethyl Resistance in Platynota idaeusalis (Lepidoptera: Tortricidae)

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Abstract
Two techniques were studied to survey for azinphosmethyl resistance in the tufted apple bud moth, Platynota idaeusalis (Walker). Third in stars were tested using a dry film contact method and topical applications were made to adult males attracted by pheromones. The dry film contact method was time-consuming and involved handling of larvae; for these reasons, the method was deemed to be unacceptable. The pheromone trap method using adult males had the greatest potential, but it presented problems with high control mortality. Although this experiment was designed to study different resistance-measuring techniques, a population from a Pennsylvania State University-owned experimental orchard was shown to be more tolerant than populations from a commercial orchard and a laboratory colony.