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Second Diapause in Spruce Budworm from Eastern Canada1

Published online by Cambridge University Press:  31 May 2012

George T. Harvey
George T. Harvey
Affiliation:
Forest Biology Laboratory, Sault Ste. Marie, Ontario
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Extract

In eastern Canada larvae of the spruce budworm, Choristoneura fumiferana (Clem.), complete their development in one year, undergoing only one period of winter diapause in the second instar, whereas in certain parts of British Columbia, at high altitudes, two years are normally required for development, the larvae spending a second period of winter diapause in the fourth instar (3, 9). Among laboratory-reared eastern budworm there are a few individuals that enter a similar second diapause (7). The low incidence and somewhat irregular occurrence of this second diapause in eastern budworm, even in laboratory rearings, have hitherto made detailed studies almost impossible, but unusual storage times and treatments used recently in rearing experiments had the unexpected effect of increasing the incidence of this tvpe of behaviour to a level where experimental analysis became possible. This paper describes these larvae and their behaviour; an account of the effects of various conditions upon the incidence of second diapause will be presented later.

Type
Articles
Information
The Canadian Entomologist , Volume 93 , Issue 7 , July 1961 , pp. 594 - 602
Copyright
Copyright © Entomological Society of Canada 1961

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References

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