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Evaluation of Mortality During the Cocoon Stage of the Larch Sawfly, Pristiphora erichsonii (Htg.)1

Published online by Cambridge University Press:  31 May 2012

W. J. Turnock  and
W. G. H. Ives
W. J. Turnock
Affiliation:
Forest Entomology Laboratory, Box 6300, Winnipeg 1, Manitoba, Canada
W. G. H. Ives
Affiliation:
Forest Entomology Laboratory, Box 6300, Winnipeg 1, Manitoba, Canada
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Extract

This is one of a series of papers on the development of life tables for the larch sawfly, Pristiphora erichsonii (Htg.), by a research team at Winnipeg. Previous papers have described techniques for obtaining population estimates for eggs, cocoons, and adults (Ives, 1955; Ives and Turnock, 1959; Turnock, 1960), and current work is concerned with the development of methods of segregating and evaluating the mortality factors affecting each stage. This paper describes the methods used to evaluate the amount of mortality caused by individual factors in the cocoon stage and discusses the problems of obtaining accurate and unbiased estimates.

Type
Articles
Information
The Canadian Entomologist , Volume 94 , Issue 9 , September 1962 , pp. 897 - 902
Copyright
Copyright © Entomological Society of Canada 1962

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References

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