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THE EFFECT OF WATER LEVELS ON LARCH SAWFLY POPULATIONS*

Published online by Cambridge University Press:  31 May 2012

R. R. Lejeune  and
B. Filuk
R. R. Lejeune
Affiliation:
Forest Insect Laboratory, Winnipeg.
B. Filuk
Affiliation:
Forest Insect Laboratory, Winnipeg.
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Extract

Cocoons of the larch sawfly normally spend from nine to ten months in the ground per annum under conditions existing in western Canada. For this reason biotic and abiotic soil factors are of paramount importance in the epidemiology of this insect. Preliminary observations and experiments indicate that ground water is one of the most important of these factors in that it not only affects sawfly development directly but also is significant in regulating sawfly predators and possibly parasites.

Type
Articles
Information
The Canadian Entomologist , Volume 79 , Issue 9-10 , October 1947 , pp. 155 - 160
Copyright
Copyright © Entomological Society of Canada 1947

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References

REFERENCES

(1) Graham, A. R., 1931. The present status of the larch sawfly. Lygaeonematus erichsonii Hartig. in Canada, with special reference to its specific parasite, Mesolius tenthredinis Morley. Can. Ent. 63: 99.CrossRefGoogle Scholar
(2) Graham, S. A., 1928. The influence of small mammals and other factors upon the larch sawfly survival. Jour. Ec. Ent. 21: 301–310.CrossRefGoogle Scholar
(3) Prebble, M. L., 1941. The diapause and related phenomena in Gilpinia polytoma (Hartig). Can. Jour. Res. D, 19: 295–322.CrossRefGoogle Scholar