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DISTRIBUTION AND FLIGHT ACTIVITY OF OBLIQUEBANDED AND THREELINED LEAFROLLERS (LEPIDOPTERA: TORTRICIDAE) IN THE OKANAGAN AND SIMILKAMEEN VALLEYS OF BRITISH COLUMBIA1

Published online by Cambridge University Press:  31 May 2012

H. F. Madsen ,
J. M. Vakenti  and
A. P. Gaunce
H. F. Madsen
Affiliation:
Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0
J. M. Vakenti
Affiliation:
Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0
A. P. Gaunce
Affiliation:
Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0
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Abstract

The 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.

Résumé

La distribution et l'activité de vol de la tordeuse à bandes obliques, Choristoneura rosaceana (Harris) et de la tordeuse rayée, Pandemis limitata (Rob.) ont été étudiées dans les vallées de l'Okanagan et de la Similkameen en Colombie-Britannique à l'aide de pièges à phéromone. L'activité des adultes a débuté tôt en juin et s'est poursuivie jusqu'en septembre. Les deux espèces étaient présentes dans toute la région pommicole des vallées de l'Okanagan et de la Similkameen. Dans le nord de l'Okanagan et les régions non cultivées d'altitude plus élevée, les captures ont indiqué que les deux espèces sont univoltines. Dans le sud de l'Okanagan et la vallée de la Similkameen, les deux espèces furent capturées en grands nombres durant toute la saison, ce qui pourrait signifier la présence de plus d'une génération. Les pièges ont capturé des nombres semblables d'adultes dans des vergers connus comme étant infestés et des vergers non-infestés, suggérant que les mâles sont attirés par les pièges dans les vergers à partir d'hôtes indigènes des milieux non cultivés.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 12 , December 1984 , pp. 1659 - 1664
Copyright
Copyright © Entomological Society of Canada 1984

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