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WITHIN-TREE DYNAMICS OF MASS ATTACK BY DENDROCTONUS PSEUDOTSUGAE (COLEOPTERA: SCOLYTIDAE) ON ITS HOST

Published online by Cambridge University Press:  31 May 2012

Björn G. Prenzel ,
William G. Laidlaw  and
Hal Wieser
Björn G. Prenzel
Affiliation:
Department of Chemistry, University of Calgary, 2500 University Drive, Calgary, Alberta, Canada T2N 1N4
William G. Laidlaw
Affiliation:
Department of Chemistry, University of Calgary, 2500 University Drive, Calgary, Alberta, Canada T2N 1N4
Hal Wieser*
Affiliation:
Department of Chemistry, University of Calgary, 2500 University Drive, Calgary, Alberta, Canada T2N 1N4
*
1Author to whom all correspondence should be addressed (E-mail: hwieser@ucalgary.ca).
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Abstract

The within-tree scale dynamics of mass attack by the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, on its host were investigated and quantified. Seven similarly sized Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco (Pinaceae), infested as part of several pheromone-induced infestations, were monitored over an entire attack season. Ninety percent of the attacks on mass-attacked trees occurred within 3 weeks of colonization; the remaining 10% occurred gradually over the remaining 7 weeks of the attack season. Vertical attack distribution followed a Gaussian form that shifted upwards on the bole with increasing attack density. The change in attack pattern associated with increasing attack density was investigated for the central vertical portion of the bole, where most attacks occurred, and where the vertical pattern was least variable. At low density, attacks were randomly distributed. As density increased, the distance between attacks decreased, eventually resulting in a uniform distribution.

Résumé

La dynamique d’une invasion massive de Dendroctones du Douglas, Dendroctonus pseudotsugae Hopkins, a été étudiée et quantifiée à l’échelle de l’arbre. Sept sapins de Douglas, Pseudotsuga menziesii (Mirb) Franco (Pinaceae), envahis dans le cadre d’une étude des infestations provoquées par plusieurs phéromones, ont été suivis pendant toute une saison d’infestation. Quatre-vingt-dix pour-cent des invasions massives se sont produites moins de 3 semaines après la colonisation; les derniers 10% se sont produits graduellement au cours des 7 dernières semaines de la saison des invasions. La répartition verticale des infestations suivait une distribution normale se déplaçant vers le haut sur le tronc à mesure que la densité augmentait. Ce changement en fonction de l’augmentation de densité a été examiné dans la portion centrale verticale du tronc, où se sont produites la plupart des invasions et où la répartition verticale était le plus stable. A densité faible, les attaques se faisaient selon une tendance aléatoire. À mesure que la densité augmentait, la distance entre les points d’infestation diminuait et la répartition des insectes devenait éventuellement uniforme.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 5 , October 1999 , pp. 635 - 643
Copyright
Copyright © Entomological Society of Canada 1999

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