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DEVELOPMENT AND DIAPAUSE IN PLEOLOPHUS BASIZONUS (HYMENOPTERA: ICHNEUMONIDAE)

Published online by Cambridge University Press:  31 May 2012

K. J. Griffiths
K. J. Griffiths
Affiliation:
Forest Research Laboratory, Department of Fisheries and Forestry, Sault Ste. Marie, Ontario
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Abstract

The upper limit for continuous development of Pleolophus basizonus lies between 25° and 30 °C since all stages develop at the former temperature and larval mortality is complete at the latter temperature. The lower limit lies between 5.5° and 10 °C, since an eonymphal diapause occurs at 5.5 °C. Between these extremes, diapause incidence varies inversely with temperature. The photoperiod experience of the parent has no effect on diapause in the progeny when the latter are reared at 15° and 18 °C, but there is an inverse relation between parental photoperiod experience and progeny diapause incidence at 10 °C. Although larvae and pupae also survive 3 months at 2 °C, most individuals probably overwinter in eonymphal diapause and their diapause requirements are fulfilled in 3 weeks at 2 °C. The incidence and rate of post-diapause development is directly related to temperature.

Type
Articles
Information
The Canadian Entomologist , Volume 101 , Issue 9 , September 1969 , pp. 907 - 914
Copyright
Copyright © Entomological Society of Canada 1969

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