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Influence of Temperature on Prespinning Eonymphs of the Swaine Jack-Pine Sawfly, Neodiprion swainei Midd. (Hymenoptera: Diprionidae)1

Published online by Cambridge University Press:  31 May 2012

J. G. Pilon ,
H. A. Tripp ,
J. M. McLeod  and
S. L. Ilnitzky
J. G. Pilon
Affiliation:
Forest Research Laboratory, P.O. Box 35, Sillery, Quebec
H. A. Tripp
Affiliation:
Forest Research Laboratory, P.O. Box 35, Sillery, Quebec
J. M. McLeod
Affiliation:
Forest Research Laboratory, P.O. Box 35, Sillery, Quebec
S. L. Ilnitzky
Affiliation:
Forest Research Laboratory, P.O. Box 35, Sillery, Quebec
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Abstract

Laboratory experiments at various constant temperatures indicate a theoretical threshold of about 40°F. for spinning of cocoons by eonymphal larvae of Neodiprion swainei Midd. As temperatures fall below 52.5°F. the increase in mortality and time required to spin is pronounced. The optimum temperature is estimated to be around 60°F. Field investigations for three consecutive years show a close correlation between rate of spinning and temperature. Temperature is considered as a prime factor influencing the spinning of cocoons and is possibly one of the more important factors governing the population dynamics of N. swainei in the Province of Quebec.

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Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 11 , November 1964 , pp. 1450 - 1457
Copyright
Copyright © Entomological Society of Canada 1964

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References

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