- MacLean, David A.
Canadian Forest Service
- MacKinnon, Wayne E.
Forestry and Environmental Management
The objective of this study was to determine the effects of soil drainage, tree species, and productivity class on stand susceptibility and vulnerability to spruce budworm damage in New Brunswick, Canada. Two hypotheses were tested: (1) there is no difference in the amount of defoliation (susceptibility) between species and between different drainage and productivity classes and (2) for a given amount of defoliation and the same relative productivity class, there is no difference in growth rate and amount of mortality (vulnerability) between plots in different drainage classes.