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CHANGES IN SPRUCE BUDWORM DEFOLIATION WITH CROWN LEVEL

Published online by Cambridge University Press:  31 May 2012

Harald Piene
Harald Piene
Affiliation:
Canadian Forest Service - Fredericton, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
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Abstract

Detailed estimates of defoliation caused by spruce budworm [Choristoneura fumiferana (Clem.)] over the crown length of young balsam fir [Abies balsamea (L.) Mill.] were made throughout a spruce budworm outbreak from 1976 to 1984 in the Cape Breton Highlands, Nova Scotia. The results show no clear tendency for a particular level of the crown to be damaged more heavily than any other. Thus, there is no reason to continue the common practice of taking samples from the mid-crown level on the assumption that they represent an ‘average’ level of defoliation either for high or low populations. Sampling from the bottom of the crown should provide a more convenient and cost-effective approach for estimating defoliation.

Résumé

Des estimations détaillées de la défoliation par la Tordeuse des bourgeons de l’épinette, Choristoneura fumiferana (Clem.), à tous les niveaux de feuillage chez déjeunes sapins baumiers, Abies balsamea (L.) Mill., ont été relevées pendant toute l’épidémie de tordeuses de 1976 à 1984, dans les hautes terres de l’île du Cap-Breton, Nouvelle-Écosse. Les résultats ont démontré qu’il n’y a pas de tendance particulière à ce qu’un niveau du feuillage soit plus endommagé que tout autre. Il n’y a donc pas de raison de continuer à échantillonner plus particulièrement le niveau moyen du feuillage sous prétexte que ces échantillons représentent un degré ’moyen’ de défoliation tant pour les populations de haute densité que pour les populations de faible densité. L’échantillonnage du feuillage inférieur constitue une approche plus commode et moins onéreuse d’estimation de la défoliation.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 6 , December 1996 , pp. 1109 - 1113
Copyright
Copyright © Entomological Society of Canada 1996

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