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OPTIMAL SAMPLE SIZE FOR THE ESTIMATION OF SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) POPULATIONS ON BALSAM FIR AND WHITE SPRUCE

Published online by Cambridge University Press:  31 May 2012

Jacques Régnière  and
C. J. Sanders
Jacques Régnière
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste Marie, Ontario P6A 5M7
C. J. Sanders
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste Marie, Ontario P6A 5M7
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Abstract

An equation is presented for the determination of sample sizes needed to estimate with a given precision the larval population density of spruce budworm on balsam fir and white spruce branch tips in Ontario. This equation is primarily applicable to low densities, but is valid to a density of 50 larvae/branch tip. The distribution of budworm larvae at densities below 0.1/branch tip is nearly random, and is aggregated at higher densities. Their distribution is the same on the two host species.

Résumé

Une équation est présentée pour la détermination des tailles d'échantillons requises pour estimer avec une certaine précision la densité des larves de la tordeuse des bourgeons de l'épinette, sur le sapin baumier et l'épinette blanche en Ontario. Cette équation est surtout applicable à de faibles densités, mais est valide jusqu'à une densité de 50 larves/bout de branche. Les larves de tordeuse sont distribuées plus ou moins au hazard à des densités inférieures à 0.1/bout de branche, mais sont fortement aggrégées à des densités plus élevées. Leur distribution est la même sur les deux espèces hôtes.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 12 , December 1983 , pp. 1621 - 1626
Copyright
Copyright © Entomological Society of Canada 1983

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