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Recent history of choristoneura fumiferana epidemics north of lac st. jean quebec canada a dendrochronological analysis


Canadian Journal of Forest Research 20(1): 1-8
Recent history of choristoneura fumiferana epidemics north of lac st. jean quebec canada a dendrochronological analysis
The chronology of spruce budworm (Choristoneura fumiferana (Clem.)) outbreaks for the past 200 years has been reconstructed by dendrochronological analysis of balsam fir (Abies balsamea (L.) Mill.) and white spruce (Picea glauca (Moench) Voss) samples from virgin forests, unaffected by insecticide spraying programs and recently protected against fires in the north and northwest of Lac Saint-Jean. Outbreaks began around 1974, 1944, 1909, and possibly, 1832. They are closely linked with those described in the Laurentide wildlife reserve. The frequency, duration and severity of growth rings suppression associated with outbreaks are similar to those registered during outbreaks in the southern forests, except for the 1974 outbreak, which was shorter and less severe. Other outbreaks registered in southern regions, where the proportion of balsam fir is higher, have reached this region where balsam fir populations are marginal. These results underline the importance of these ecological disturbances in the population dynamics of the host trees of the region.


Accession: 007725162



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