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Laboratory and Field Investigations of the Effect of Temperature on the Development of Neodiprion sertifer (Geoff.) in the Cocoon1

Published online by Cambridge University Press:  31 May 2012

D. R. Wallace  and
C. R. Sullivan
D. R. Wallace
Affiliation:
Forest Insect Laboratory, Sault Ste. Marie, Ontario
C. R. Sullivan
Affiliation:
Forest Insect Laboratory, Sault Ste. Marie, Ontario
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Abstract

Laboratory studies show that diapause, or eonymphal development, has a temperature optimum approximating 8 °C, at which some 29 days are required for its completion. The optimum for morphogenesis is 22 °C. About 33 and 37 days for females and males, respectively, are required for its completion.

Field data for three sites with mean temperatures near 22, 19, and 16 °C. show that emergence took place earliest at the intermediate site and latest at the exposed site, which experienced the highest mean temperature. Emergence of males and females overlapped, but at the shaded site, having the lowest mean temperature, females emerged sooner than males, whereas the reverse was observed at the exposed site.

The length of the eonymphal stage in the field is dependent upon site temperature and can be predicted from laboratory data. The duration of the pronymphal stage is dependent not only upon site temperature, but also upon the length of time which has been required for eonymphal development. Thus the longer the eonymphal period. the shorter the pronymphal period. This compensatory mechanism is probably due to a temperature effect on any morphogenesis that takes place concurrently with diapause.

Type
Articles
Information
The Canadian Entomologist , Volume 95 , Issue 10 , October 1963 , pp. 1051 - 1066
Copyright
Copyright © Entomological Society of Canada 1963

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