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POPULATION DENSITY ESTIMATION OF SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (CLEM.) (LEPIDOPTERA: TORTRICIDAE) ON BALSAM FIR AND WHITE SPRUCE FROM 45-CM MID-CROWN BRANCH TIPS

Published online by Cambridge University Press:  31 May 2012

Jacques Régnière ,
Timothy J. Lysyk  and
Michel Auger
Jacques Régnière
Affiliation:
Forestry Canada, Qukbec Region, Laurentian Forestry Centre, PO Box 3800, Sainte-Foy, Québec, Canada G1V 4C7
Timothy J. Lysyk
Affiliation:
Forestry Canada, Great Lakes Forestry Centre, PO Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
Michel Auger
Affiliation:
Minisère de l'énergie et des ressources du Québec, 1530 Blvd de l'Entente, Québec, Québec, Canada
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Abstract

The 45-cm mid-crown branch tip from balsam fir and white spruce is described in terms of surface area, fresh weight, and bud density. Fresh weight is suggested as the most appropriate unit to express density of all stages of the spruce budworm’s, Choristoneura fumiferana (Clem.), life cycle, particularly for the purposes of comparisons between host species and locations with different foliage conditions.

Changes in distribution of the spruce budworm in the crown of balsam fir are documented for all stages of the insect’s life cycle. Correction factors to account for these changes when estimating density on the basis of the 45-cm branch tip sampling unit are given for balsam fir and white spruce.

The amount of error in detection of spruce budworm larvae on foliage of both host trees by sampling personnel varied systematically and consistently as a function of insect development. A method to compensate for this type of error is also suggested.

Résumé

Le bout de branche de 45 cm prélevé à mi-couronne sur du sapin baumier et de l’épinette blanche est décrit en termes de surface, poids frais et densité des bourgeons. Le poids frais est proposé comme étant l’unité la plus utile pour l’expression de la densité des populations de la tordeuse des bourgeons de l’épinette, Choristoneura fumiferana (Clem.), à tous les stades du développement. Ceci est particulièrement approprié lors de la comparaison des niveaux de populations entre les deux essences hôtes, ou entre des endroits ayant des conditions de feuillage différentes.

Les changements de distribution de la tordeuse des bourgeons de l’épinette au sein de la couronne du sapin baumier au cours de son cycle vital ont été observés. Des facteurs de correction permettant de compenser pour ces changements dans l’estimation des niveaux de population à l’aide de bouts de branches de 45-cm ont été développés pour le sapin baumier et l’épinette blanche.

Le taux d’erreur encouru par le personnel dans la détection des larves de cet insecte sur le feuillage des deux essences varie selon le stade de développement. Un facteur de correction pour ce type d’erreur dans l’estimation de la densité est aussi proposé.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 3 , March 1989 , pp. 267 - 281
Copyright
Copyright © Entomological Society of Canada 1989

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