Canadian Forest Service Publications
Rating vulnerability of balsam fir to spruce budworm attack in Quebec. 1982. Blais, J.R.; Archambault, L. Environment Canada, Canadian Forestry Service, Laurentian Forest Research Centre, Sainte-Foy, Quebec. Information Report LAU-X-51. 19 p.
Issued by: Laurentian Forestry Centre
Catalog ID: 14366
CFS Availability: PDF (download)
A working Group of Canadian Forestry Service scientists from Ontario, Quebec, the Maritimes, and Newfoundland developed a classification of forests with respect to their vulnerability to spruce budworm (Choristoneura fumiferana (Clem.)) attack. Forest inventory and current budworm damage data for Quebec were particularly suitable to the elaboration and the testing of a vulnerability rating system. The vulnerability index was calculated on a forest management unit basis and was based on the volume of balsam fir (Abies balsamea (L.) Mill.) and white spruce (Picea glauca (Moench) Voss), the maturity of fir, the volume of black spruce (P. mariana (Mill.) B.S.P.) and red spruce (P. rubens Sarg.), and a climate rating based on temperature and precipitation. Calculation of the vulnerability index for each of 75 forest management units showed good accord between the results and actual damage. The application of the system for providing advance warning of future outbreaks and for assisting in the preparation and the implementation of short- and long-term forest management practices is discussed.
Also available under the title:
Vulnérabilité du sapin baumier aux attaques de la tordeuse des bourgeons de l'épinette au Québec (French)