MONITORING AZINPHOSMETHYL RESISTANCE IN ADULT MALE PLATYNOTA-IDAEUSALIS (LEPIDOPTERA, TORTRICIDAE) IN APPLE FROM GEORGIA TO NEW-YORK

Level of resistance found within an orchard may be influenced by the intensity of fruit production within a region. Level of resistance to azinphosmethyl was positively correlated with current seasonal carbamate use, but was not significantly correlated with current use of azinphosmethyl or other organophosphates. Levels of resistance and fruit injury were both significantly correlated with population densities in orchards. Many apple growers have responded to the development of azinphosmethyl resistance within their orchards with increased use of carbamates and decreased use of azinphosmethyl. Levels of fruit injury were highest in orchards where populations of Pl. idaeusalis were moderately resistant to azinphosmethyl, seasonal azinphosmethyl use was high, and only small amounts of carbamate insecticides were used. -from Authors