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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.

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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