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Effects of Water Levels on the Overwintering Survival and Emergence of the Larch Sawfly in a Bog Habitat

Published online by Cambridge University Press:  31 May 2012

W. G. H. Ives  and
L. D. Nairn
W. G. H. Ives
Affiliation:
Department of Forestry of Canada, Forest Research Laboratory, Winnipeg, Manitoba
L. D. Nairn
Affiliation:
Department of Forestry of Canada, Forest Research Laboratory, Winnipeg, Manitoba
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Abstract

The effects of fluctuating water tables on the survival of the larch sawfly, Pristiphora erichsonii (Hartig) (Hymenoptera: Tenthredinidae), were studied by burying cocoons at different depths in a tamarack bog. Most larvae in cocoons flooded during August or September died before winter. The percentage of overwintering survival of unflooded cocoons remained constant from late fall until development began in the spring. The higher the cocoons were above the maximum water table during August and September, the greater was the percentage of overwintering survival and subsequent adult emergence.

Type
Articles
Information
The Canadian Entomologist , Volume 98 , Issue 7 , July 1966 , pp. 768 - 777
Copyright
Copyright © Entomological Society of Canada 1966

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References

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