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A Cartographic History of Spruce Budworm Outbreaks and Aerial Forest Spraying in the Atlantic Region of North America, 1949–19591

Published online by Cambridge University Press:  31 May 2012

F. E. Webb ,
J. R. Blais  and
R. W. Nash
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Extract

The spruce budworm (Choristoneura fumiferana (Clem.)) is a forest pest in all Canadian Provinces and Territories, and in the northeastern, midwest, and northwestern Unired States. It is by iar the most destructive insect affeiting the extensive balsam fir-spruce forest types in Ontario, Quebec, the Maritime Provinces, and Maine. Outbreaks of varying extent have been reported from these regions almost every year for the past half-century (deGryse, 1947). Periods in which outbreaks were particularly severe and widespread occurred from about 1909 to 1920 and in the 1940's and 1950's. In both periods, outbreaks showed a tendency to shift from west to east, intensifying first in parts of northern Ontario and Quebec and dying out in the Atlantic region south of the St. Lawrence River.

Type
Articles
Information
The Canadian Entomologist , Volume 93 , Issue 5 , May 1961 , pp. 360 - 379
Copyright
Copyright © Entomological Society of Canada 1961

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