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EFFECT OF TEMPERATURE DURING MAY TO AUGUST ON TERMINATION OF PROLONGED DIAPAUSE IN THE DOUGLAS-FIR CONE MOTH (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

G.E. Miller  and
D.S. Ruth
G.E. Miller
Affiliation:
Canadian Forestry Service, Pacific Forestry Centre, Victoria, British Columbia, Canada V8Z 1M5
D.S. Ruth
Affiliation:
Canadian Forestry Service, Pacific Forestry Centre, Victoria, British Columbia, Canada V8Z 1M5
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Extract

The Douglas-fir cone moth, Barbara coljaxiana (Kearfott) (Lepidoptera: Tortricidae), has the capacity for prolonged diapause, i.e. diapause for two or more winters (Hedlin 1960). This diapause allows for temporal spacing of populations and reduction of intraspecific competition. Specifically, when cone crops are small, excessive moth densities can occur and cause conelet mortality prior to completion of feeding by cone moth larvae, which results in moth mortality. If all moths emerged each year, moth-caused destruction of the conelet population, particularly in years of light production, would have drastic effects on the moth population.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 10 , October 1986 , pp. 1073 - 1074
Copyright
Copyright © Entomological Society of Canada 1986

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References

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