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THE LARCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) AND ITS PARASITES: II. THE INFLUENCE OF DIFFERENT GROWTH STAGES OF LARIX OCCIDENTALIS FOLIAGE ON CASEBEARER DEVELOPMENT AND SURVIVAL

Published online by Cambridge University Press:  31 May 2012

R. B. Ryan
R. B. Ryan
Affiliation:
Forestry Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Corvallis, Oregon 97331
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Abstract

Last-stage larvae of Coleophora laricella (Hbn.) were transferred to foliated Larix occidentalis Nutt. trees in four stages of growth for feeding. Based on insect survival, development rate, and size, trees with newly flushing foliage were best for rearing; trees which had completed shoot elongation were nearly as favorable. Both were distinctly superior to trees with elongating shoots and to trees with foliage so old that the current year’s buds were breaking. It is important to recognize the effects of tree growth stage when rearing C. laricella parasites in the laboratory, because parasite survival and sex ratio can be significantly influenced.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 4 , April 1979 , pp. 477 - 480
Copyright
Copyright © Entomological Society of Canada 1979

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References

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