Abstract
Abstract Epiphyas postvittana (Walker) resistant to azinphos-methyl caused 1.7 and 5.4% fruit damage in 1983/84 and 1985/86 in apple orchards at Moutere Bluffs, New Zealand. Surveys from 1984 to 1989 of resistance in orchards and scrub nearby showed 3.5% survival of the diagnostic dose (LD99.95) in January and 7.6% survival in April. Survive did not increase between years. Catches in pheromone traps inside affected orchards indicated high levels of male activity despite regular application of chlorpyrifos. Mating disruption, along with the application of chlorpyrifos, was investigated as a possible solution to the continued inability to achieve economically acceptable leafroller control with insecticides alone. Two ha of apple trees were treated with Shin Etsu Chemical Co. dispensers (1000/ha) containing (E)-11-tetradecenyl acetate and (E,E)-9, 11-tetradecadien-1-yl acetate (56.5 and 2.8 mg per dispenser), in January 1987. No males were caught for over 11 months after the pheromone application. Harvest da...
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