Canadian Forest Service Publications
Control of Armillaria and Phellinus root diseases: 20-year results from the Skimikin stump removal experiment. 1988. Morrison, D.J.; Wallis, G.W.; Weir, L.C. Forestry Canada, Pacific and Yukon Region, Victoria, BC. Information Report BC-X-302. 16 p.
Issued by: Pacific Forestry Centre
Catalog ID: 2819
One-half of a 2.56-ha tract in a mature Douglas-fir lodgepole pine stand in which 60-70% of stems had been killed or were infected by Phellinus weirii was whole-tree logged and root raked while the other half was conventionally logged. Whole-tree logging and root raking removed almost all roots larger than 2 cm in diameter from the upper 60 cm of soil. Seedlings of Douglas-fir, lodgepole pine, western red cedar and paper birch were planted alone and in all combinations of two species in 0.04-ha plots. Tree mortality was recorded periodically over 20 years. After seedlings became established, the principal causes of mortality were the root diseases caused by Armillaria ostoyae and P. weirii. Cumulative percent mortality of Douglas-fir by A. ostoyae and P. weirii and of lodgepole pine by A. ostoyae was less in the treated block than in the untreated block. No lodgepole pines were killed by P. weirii. Plots in which rows of lodgepole pine or Douglas-fir alternate with rows of cedar or birch had fewer and smaller disease centers than plots of lodgepole pine or Douglas-fir, or both. Height and diameter growth of Douglas-fir and lodgepole pine were greater in plots in the treated block than in those in the untreated block.