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ETHANOL INDUCES ATTACK ON TREES BY SPRUCE BEETLES, DENDROCTONUS RUFIPENNIS (COLEOPTERA: SCOLYTIDAE)

Published online by Cambridge University Press:  31 May 2012

Henry A. Moeck
Henry A. Moeck
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
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Abstract

When 95% ethanol was sprayed at the rate of approximately 46 ml/m2 of bark surface on the lower 1 or 2 m of standing living spruce trees, Picea engelmannii Parry – P. glauca (Moench) Voss hybrid population, 23 of 47 and 18 of 19 treated trees in two areas received one to many spruce beetle, Dendroctonus rufipennis (Kirby), attacks, whereas only 2 of 63 and 2 of 64 untreated trees, respectively, were attacked. Some of the treated trees were killed by mass attacks of the beetles, but most trees pitched out the attacks. Thus beetle attacks on essentially resistant trees were induced by the ethanol treatment. However, spruce beetles were not attracted by the ethanol treatment.

Résumé

À la suite d’un épandage d’éthanol à 95% à raison d’environ 46 mL/m2 de surface d’écorce sur 1 à 2 m de la base des arbres d’un peuplement d’épinette hybride (Picea engelmannii Parry – P. glauca (Moench) Voss), 23 des 47 et 18 des 19 arbres ainsi traités dans deux aires ont subi de une à plusieurs attaques du dendroctone de l’épinette (Dendroctonus rufipennis (Kirby)). Tandis que seulement 2 des 63 et 2 des 64, respectivement, des arbres non-traités ont subi des attaques. Certains arbres ont été tués par les attaques massives de dendroctones, mais la plupart d’entre eux y ont résisté. Donc, les attaques de dendroctones sur des arbres qui n’y sont pas sujets ont été provoquées par le traitement à l’éthanol. Toutefois, les dendroctones n’étaient pas attirés par le traitement à l’éthanol.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 10 , October 1981 , pp. 939 - 942
Copyright
Copyright © Entomological Society of Canada 1981

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