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Some Ecological Factors Governing Populations of the Larch Sawfly, Pristiphora erichsonii (Htg.)1

Published online by Cambridge University Press:  31 May 2012

R. R. Lejeune
R. R. Lejeune
Affiliation:
Forest Insect Laboratory, Winnipeg, Manitoba
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Extract

Several ecological factors governing populations of the larch sawfly, Pristiphora erichsonii (Htg.), have been studied in Manitoba and Saskatchewan since the present outbreak began about 1939. It soon became clear that soil moisture, parasires and predators, and the growth habits of tamarack were among the most important components of the environmental resistance. Data from ohservations and experiments were gathered by several investigators of the Forest Insect Laboratory, Winnipeg. Manitoba, and are still largely unpublished. In this paper, an attempt is made to appraise the over-all effect of these factors on abundance of the larch sawfly.

Type
Articles
Information
The Canadian Entomologist , Volume 83 , Issue 6 , June 1951 , pp. 152 - 156
Copyright
Copyright © Entomological Society of Canada 1951

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References

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