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RESPONSE OF THE WESTERN BALSAM BARK BEETLE, DRYOCOETES CONFUSUS SWAINE (COLEOPTERA: SCOLYTIDAE), TO HOST TREES BAITED WITH ENANTIOSPECIFIC BLENDS OF EXO- AND ENDO-BREVICOMIN

Published online by Cambridge University Press:  31 May 2012

Alejandro D. Camacho  and
John H. Borden
Alejandro D. Camacho
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
John H. Borden
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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Abstract

The response of the western balsam bark beetle, Dryocoetes confusus Swaine, to subalpine firs, Abies lasiocarpa (Hook.) Nutt., baited with (±)-exo-brevicomin (EXOB) or 9:1 blends of EXOB and endo-brevicomin (ENDOB), in two chiral combinations: (+):(±) and (+):(+), was assessed in a heavily infested stand in British Columbia. Unbaited control trees were not attacked, and the proportion of mass-attacked baited trees was similar for all other treatments. However, trees baited with the (+):(+) blend had the highest number of attacks per square metre, and they were also surrounded by the most attacked trees. The (+):(±) blend was intermediate in attractancy, and (±)EXOB was the least attractive bait. Pheromone-based management of D. confusus infestations may be more effective with the 9:1 blend of (+)EXOB:(+)ENDOB than with the previously used (±)EXOB baits.

Résumé

La réponse comportementale de Dryocoetes confusus Swaine vis-à-vis de sapins subalpins, Abies lasiocarpa (Hook.) Nutt., amorcés avec des mélanges phéromonaux a été testée sur un site fortement infesté en Colombie Britannique. Trois traitements ont été utilisés, du (±)-exo-brévicomine (EXOB) seul, et deux mélanges chiraux d’EXOB et d’endo-brévicomine (ENDOB) dans la proportion 9 : 1, (+) : (±) et (+) : (+). La proportion des arbres amorcés qui ont subis des attaques massives a été la même pour les différents traitements, au contraire des arbres contrôles, non amorcés, qui n’ont pas été attaqués. Le nombre de galleries contenant des larves a été plus important dans le cas des arbres amorcés avec le mélange (+) : (+). De plus, pour ces arbres, le nombre de points d’attaque par mètre carré et le nombre d’arbres environnant attaqués ont été plus élevés. Le traitement avec le (±)EXOB s’est averré le moins attractif alors que le mélange (+) : (±) a montré un pouvoir attractif intermédiaire. L’utilisation d’un mélange phéromonal 9 : 1 de (+)EXOB : (+)ENDOB pour contrôler l’infestation de D. confusus devrait être plus efficace que le (±)EXOB actuellement employé.

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 1 , February 1994 , pp. 43 - 48
Copyright
Copyright © Entomological Society of Canada 1994

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