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A Survey of Parasites of the Larch Sawfly (Pristiphora erichsonii (Hartig)) in Manitoba and Saskatchewan1

Published online by Cambridge University Press:  31 May 2012

R. R. Lejeune  and
V. Hildahl
R. R. Lejeune
Affiliation:
Forest Biology Laboratory, Winnipeg, Canada
V. Hildahl
Affiliation:
Forest Biology Laboratory, Winnipeg, Canada
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Extract

Records indicate that the present outbreak of the larch sawfly in Manitoba and Saskatchewan began about 1938 in the Spruce Woods-Riding Mountain area of Manitoba. Since then, it has spread in all directions where the principal host tree, larch, Larix laricina (Du Roi) K. Koch, occurs. It now includes nearly all of Manitoba and Saskatchewan, northwestern Ontario, part of northeastern Alberta, and northern Minnesota. In 1944, an annual survey of parasites that attack larvae of the larch sawfly was begun by the Forest Biology Laboratory, Winnipeg. The purposes of the survey were to determine (a) the principal species of parasites, (b) their abundance and effectiveness, and (c) .host-parasite population trends.

Type
Articles
Information
The Canadian Entomologist , Volume 86 , Issue 8 , August 1954 , pp. 337 - 345
Copyright
Copyright © Entomological Society of Canada 1954

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References

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