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Studies of Predators of the Balsam Woolly Aphid, Adelges piceae (Ratz.) (Homoptera: Adelgidae) VI. Aphidecta obliterata (L.) (Coleoptera: Coccinellidae), an Introduced Predator in Eastern Canada1, 2

Published online by Cambridge University Press:  31 May 2012

N. R. Brown  and
R. C. Clark
N. R. Brown
Affiliation:
Professor of Forest Entomology, University of New Brunswick, Fredericton, N.B.
R. C. Clark
Affiliation:
Research Officer, Forest Biology Laboratory, Fredericton, N.B.
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Extract

Aphidecta obliterata (L.) is a common predator on conifer-infesting adelgids and aphids in Western Europe, including Scandinavia and the British Isles (Wylie, 1958b). The life cycle in Europe and descriptions of the various stages have been published (Weise, 1892; Portevin, 1931; Van Emden, 1949; Van Dinther, 1951; Wylie, 1958a). Beginning in 1941 several attempts have been made to introduce this species into Eastern Canada against the balsam woolly aphid, Adelges piceae (Ratz.). The initial liberations from England and Germany were apparently unsuccessful due to the inability of the insect to survive the Canadian winter conditions. Later collections were made in Sweden, Czechoslovakia, and Switzerland (Table I) from areas where the winter conditions more closely resemble those in Canada. These liberations also proved unsuccessful. The present paper brings together all available information on the liberations and related experiments olbtained during the liberation years.

Type
Articles
Information
The Canadian Entomologist , Volume 91 , Issue 9 , September 1959 , pp. 596 - 599
Copyright
Copyright © Entomological Society of Canada 1959

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References

Clark, R. C., and Brown, N. R.. 1958. Studies of predators of the balsam woolly aphid, Adelges piceae (Ratz.) (Homoptera: Adelgidae). V. Laricobius erichsonii Rosen. (Coleoptera: Derodontidae), an introduced predator in eastern Canada. Canadian Ent. 90 (11): 657–672.CrossRefGoogle Scholar
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