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NOTES ON THE BIOLOGY OF THE ENGELMANN SPRUCE WEEVIL, PISSODES ENGELMANNI (CURCULIONIDAE: COLEOPTERA) AND ITS PARASITES AND PREDATORS1

Published online by Cambridge University Press:  31 May 2012

Robert E. Stevenson
Robert E. Stevenson
Affiliation:
Forest Research Laboratory, Department of Forestry and Rural Development, Calgary, Alberta
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Abstract

The Engelmann spruce weevil, Pissodes engelmanni Hopkins, is an indigenous pest of spruce regeneration in western Canada and the adjacent United States. It is univoltine, overwintering as an adult in the duff beneath the host trees. Eggs are deposited in feeding punctures in the terminal leader. Larvae feed downward in the phloem causing two or more years loss of height growth. Deformities incurred by three or more consecutive years of weevil attacks produce a tree of no commercial value. The incidence of weevilling is most numerous in open grown, even-aged, young stands. Of 14 insect parasites and one predator, Dolichomitus terebrans nubilipennis (Viereck), Eurytoma pissodis Girault and Lonchaea corticis Taylor are considered principal natural control agents.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 2 , February 1967 , pp. 201 - 213
Copyright
Copyright © Entomological Society of Canada 1967

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