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The Black-headed Budworm in Eastern Canada

Published online by Cambridge University Press:  31 May 2012

C. A. Miller
C. A. Miller
Affiliation:
Forest Researoh Laboratory, Department of Forestry of Canada, Fredericton, New Brunswick
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Abstract

The black-headed budworm, Acleris variana (Fern.), is a forest pest native to North America. Periodic outbreaks have been recorded since the late 1920's in eastern Canada, where the preferred host is balsam fir. An outbreak generally causes 2 years of severe defoliation but no tree mortality and only a slight loss in radial increment.

Color patterns and measurements of the immature stages are given and limited data on age-interval survival rates are discussed. A key-factor analysis of 17 years’ data shows that population release is associated with years of low parasitism and favorable weather, while population decline is largely determined by late larval parasitism.

Type
Articles
Information
The Canadian Entomologist , Volume 98 , Issue 6 , June 1966 , pp. 592 - 613
Copyright
Copyright © Entomological Society of Canada 1966

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