DISTRIBUTION AND FLIGHT ACTIVITY OF OBLIQUEBANDED AND THREELINED LEAFROLLERS (LEPIDOPTERA: TORTRICIDAE) IN THE OKANAGAN AND SIMILKAMEEN VALLEYS OF BRITISH COLUMBIA

Abstract

AbstractThe distribution and adult flight activity of obliquebanded leafroller, Choristoneura rosaceana (Harris) and threelined leafroller, Pandemis limitata (Rob.) were studied in the Okanagan and Similkameen valleys of British Columbia using traps baited with the sex pheromone of each species. Adult activity began in early June and continued through September and the two species were distributed throughout the apple-growing region of the Okanagan and Similkameen valleys. In the northern Okanagan and in uncultivated areas at higher elevation, the trap captures indicated that both species are univoltine. In the southern Okanagan and the Similkameen Valley, large numbers of both species were captured throughout the season which may indicate more than one generation. Traps captured similar numbers of adults in orchards with known infestations and in orchards lacking infestations, suggesting that males are attracted to traps in orchards from native hosts in uncultivated sites.