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Predicting defoliation by Choristoneura biennis (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  02 April 2012

V.G. Nealis  and
R. Turnquist
V.G. Nealis*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
R. Turnquist
Affiliation:
Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
*
1 Corresponding author (e-mail: vnealis@pfc.forestry.ca).
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Abstract

The 2-year-cycle spruce budworm, Choristoneura biennis Free. (Lepidoptera: Tortricidae), causes defoliation of spruce – subalpine fir forests in British Columbia, Canada. Historical and newly obtained data were used to develop a linear regression relating percent defoliation in the 2nd feeding year of the life cycle to the percentage of shoots damaged in the previous, 1st feeding year of the life cycle. The resulting regression was tested with independent data and correctly predicted (95% prediction intervals) defoliation in 14 of 15 stands. Patterns of defoliation were similar on white spruce, Picea glauca (Moench) Voss (Pinaceae), and subalpine fir, Abies lasiocarpa (Hook.) Nutt. (Pinaceae), and hence the regression can be used for either mixed or pure stands of either species.

Résumé

La tordeuse bisannuelle de l'épinette, Choristoneura biennis Free. (Lepidoptera: Tortricidae), est responsable de la défoliation de forêts d'épinettes et de sapins subalpins en Colombie Britannique, Canada. Des données anciennes et nouvelles nous ont servi à mettre au point une régression linéaire qui relie le pourcentage de défoliation durant la seconde année d'alimentation du cycle biologique et le pourcentage de pousses endommagées l'année précédente, la première année d'alimentation du cycle. Cette régression a pu être évaluée avec des données indépendantes et elle prédit avec justesse (dans les intervalles de prédiction de 95 %) la défoliation dans 14 boisés sur 15. Les patterns de défoliation sont les mêmes sur l'épinette blanche, Picea glauca (Moench) Voss (Pinaceae), et le sapin subalpin, Abies lasiocarpa (Hook.) Nutt. (Pinaceae); la régression peut donc être utilisée pour des boisés purs ou mixtes des deux espèces.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 135 , Issue 6 , December 2003 , pp. 903 - 907
Copyright
Copyright © Entomological Society of Canada 2003

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