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1- AND 2-YEAR DORMANCY OF THE DOUGLAS-FIR CONE MOTH, BARBARA COLFAXANA KFT. (LEPIDOPTERA: OLETHREUTIDAE): POSSIBLE RELATION TO INDIVIDUAL WEIGHTS

Published online by Cambridge University Press:  31 May 2012

T.S. Sahota  and
A. Ibaraki
T.S. Sahota
Affiliation:
Forestry Canada, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
A. Ibaraki
Affiliation:
Forestry Canada, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
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Extract

Many cone and seed insects exhibit a dormancy in which the individuals may undergo a diapause that lasts 1, 2, or more winters and the proportion of 1-year diapause (1YD) and 2-year diapause (2YD) varies from year to year (Hedlin et al. 1980). Thus, segregating the two diapause types carries a practical importance for forecasting the attacking adult population in a given year. Based primarily on teleological reasoning it has been argued that insects committed to a longer dormancy may have higher weights with metabolites to sustain survival for a longer period. Individual weights have been examined with the hope of separating 1YD from 2YD individuals.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 5 , October 1991 , pp. 1153 - 1155
Copyright
Copyright © Entomological Society of Canada 1991

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References

Bakke, A. 1971. Distribution of prolonged diapausing larvae in populations of Laspeyresia strobilella L. (Lep., Tortricidae) from spruce cones. Norsk. ent. Tiddsskr. 18: 89–93.Google Scholar
Hedlin, A.F., Yates, H.O. III, Tovar, D.C., Ebel, G.H., Koerber, T.W., and Merlel, E.P.. 1980. Cone and Seed Insects of North American Conifers. Canadian Forestry Service, Ottawa. pp. 11, 60–62.Google Scholar
Sahota, T.S., Ibaraki, A., and Farris, S.H.. 1985. Pharate adult diapause of Barbara colfaxiana (Kft.): Differentiation of 1- and 2-year dormancy. Can. Ent. 117: 873–876.CrossRefGoogle Scholar
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