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Outbreaks of the Forest Tent Caterpillar, Malacosoma disstria Hbn., a Periodic Defoliator of Broad-leaved Trees in Ontario1

Published online by Cambridge University Press:  31 May 2012

W. L. Sippell
W. L. Sippell
Affiliation:
Forest Insect Laboratory, Sault Ste. Marie, Ontario
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Extract

Severe defoliation of aspen stands by the forest tent caterpillar, Malacosoma disstria Hbn., became apparent in 1948 in three widely separated regions in Ontario, and by 1949 it was clear that another general outbreak of this defoliator had begun. In 1950 the Forest Insect Survey (cf. McGugan, 1958) initiated an intensive program of observation, collecting, and rearing to record the progress of the outbreak and study the parasite complex of the insect. This paper compares the outbreak in the early ‘fifties’ with earlier ones, and attempts to describe the pattern of build-up and decline of forest tent caterpillar populations within extensive forested areas.

Type
Articles
Information
The Canadian Entomologist , Volume 94 , Issue 4 , April 1962 , pp. 408 - 416
Copyright
Copyright © Entomological Society of Canada 1962

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