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SAMPLING SYSTEMS FOR THE BIRCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE)

Published online by Cambridge University Press:  31 May 2012

A. G. Raske  and
M. Alvo
A. G. Raske
Affiliation:
Newfoundland Forest Research Center, Canadian Forestry Service, St. John's, Newfoundland A1C 5X8
M. Alvo
Affiliation:
Applied Statistics and Scientific Computing Branch, Environment Canada, Ottawa, Ontario K1A 0E7
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Abstract

Sample sizes needed to measure population levels of the birch casebearer, Coleophora fuscedinella Zeller, and its damage to white birch, Betula papyrifera Marsh, were calculated for various degrees of confidence and assurance. Both a non-destructive and a destructive sampling plan are presented and a new method to classify the damage level of a stand. This method uses a maximum likelihood technique to estimate the proportion of trees of various damage classes.

Résumé

On a calculé avec divers degrés de confiance et d’assurance, les grandeurs d’échantillons nécessaires pour déterminer les populations de Porte-case du Bouleau, Coleophora fuscedinella Zeller, et ses dommages sur le Bouleau à papier, Betula papyrifera March. Les auteurs présentent un plan d’échantillonnage destructeur et un autre non destructeur, ainsi qu’une nouvelle méthode pour classer les niveaux des dommages dans un peuplement. Cette méthode utilise une technique à vraisemblance maximale, pour évaluer la proportion d’arbres par catégorie de dommages. On présente aussi des équations de régression pouvant prévoir la sévérité de la défoliation par le Porte-case du Bouleau ayant hiverné et les ordres de grandeur d’échantillons qu’il faut pour mesurer la défoliation.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 8 , August 1979 , pp. 875 - 882
Copyright
Copyright © Entomological Society of Canada 1979

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References

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