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EFFECTS OF SEMIOCHEMICAL BAITING ON THE ATTRACTIVENESS OF FELLED AND UNFELLED LETHAL TRAP TREES FOR SPRUCE BEETLE, DENDROCTONUS RUFIPENNIS (KIRBY) (COLEOPTERA: SCOLYTIDAE), MANAGEMENT IN AREAS OF HIGH AND LOW BEETLE POPULATIONS

Published online by Cambridge University Press:  31 May 2012

D.R. Gray ,
E. Holsten  and
M. Pascuzzo
D.R. Gray
Affiliation:
British Columbia Ministry of Forests, Nelson Forest Region, British Columbia, Canada
E. Holsten
Affiliation:
British Columbia Ministry of Forests, Nelson Forest Region, British Columbia, Canada
M. Pascuzzo
Affiliation:
British Columbia Ministry of Forests, Nelson Forest Region, British Columbia, Canada
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Abstract

A two by two factorial experiment in a randomized complete block design tested single and combined effects of tree felling and semiochemical baiting on the attractiveness of spruce (Picea spp.) trees treated with monosodium methanearsenate (MSMA) to Dendroctonus rufipennis (Kirby) in British Columbia and Alaska. In British Columbia, tree felling and semiochemical baiting had significant effects on attack density, but in Alaska only tree felling had a significant effect. Semiochemical baiting had a significant effect on within-tree attack distribution in British Columbia but cot in Alaska, regardless of the felling treatment. The felled treatment captured more beetles than the not-felled treatment regardless of the baiting treatment in British Columbia, but only in the absence of a semiochemical bait in Alaska. The differences between the two locations may have been caused by lower temperatures and beetle population density in Alaska. Effective spruce beetle management with MSMA-treated trees requires tree felling, and beetle capture can be improved with the use of a semiochemical bait.

Résumé

Une expérience factorielle deux par deux (randomized complete block design) a testé les effets de l’abbatage d’arbres et d’appâts semiochimiques sur l’attirance d’épinettes (Picea spp.) traitées au méthanearsenate monosodique (MSMA) pour Dendroctonus rufipennis (Kirby) en Colombie britannique et en Alaska. En Colombie britannique, l’abbatage et les appâts semiochimiques ont eu un effet significatif sur la densité des attaques, mais en Alaska seulement l’abbatage a eu un effet significatif. Les appâts semiochimiques ont eu un effet significatif sur la distribution intra-arbre des attaques en Colombie britannique mais pas en Alaska, quelque soit le traitement d’abbatage. Les arbres abbatus ont capturé plus de dendroctones que les arbres non-abbatus en présence ou en l’absence d’appât en Colombie britannique, mais seulement en l’absence d’appât en Alaska. Les différences entre les deux sites peuvent avoir été causées par les températures et niveaux de population plus bas en Alaska. Une régie efficace du dendroctone de l’épinette utilisant des arbres traités au MSMA requiert que les arbres soient abbatus. Les captures de dendroctoncs peuvent être améliorées par l’utilisation d’appâts semiochimiques.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 2 , April 1990 , pp. 373 - 379
Copyright
Copyright © Entomological Society of Canada 1990

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