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RELATION OF BIRCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) NUMBERS TO PER CENT DEFOLIATION OF WHITE BIRCH

Published online by Cambridge University Press:  31 May 2012

A. G. Raske  and
D. G. Bryant
A. G. Raske
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's A1C 5XB
D. G. Bryant
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's A1C 5XB
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Abstract

Regression equations of per cent defoliation of white birch stands, Betula papyrifera Marsh., to birch casebearer, Coleophora fuscedinella Zeller, eggs or larvae had precisions (standard error of the estimate, b) of about 20% of the estimate. Although log-transformation of counts stabilized the variance, it did not increase the precision of the equations. Precision of regression estimates based on data from whole-stratum sample units differed little from that from only four mid-crown branches. The latter sample universe is smaller and more rapidly examined.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 10 , October 1977 , pp. 1307 - 1312
Copyright
Copyright © Entomological Society of Canada 1977

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