Growth Loss and Mortality in Laminated Root Rot Infection Centers in Second-Growth Douglas-fir on Vancouver Island
Growth loss and mortality were measured in 10-m wide transects through 16 laminated root rot (Phellinus weirii (Murr.) Gilb.) infection centers and their adjacent surroundings in three 30- to 40-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands on Vancouver Island, British Columbia. In all stands, average stem size and periodic annual increment (PAI) were significantly less in infection centers than in surroundings. Amount of reduction in infection centers relative to their surroundings varied from stand to stand but percent reduction did not vary among stands. Reductions for dbh, basal area (BA), height, and volume averaged 6.1, 10.3, 4.3, and 10.3 percent respectively, and average reductions for PAI for the same variables were 10.7, 15.7, 10.7, and 13.5 percent respectively. Periodic increment percent (PI percent) was lower in infection centers for all variables in one stand and in height or volume in the other two. Percent reduction of PAI in infection centers for the last 10 years was significantly greater than for previous decades. Form quotient did not differ significantly between infection centers and their surroundings. Infected trees killed by P. weirii averaged 32.3 percent of stems and 30.2 percent of BA; there were no significant differences among stands. Basal area in killed trees was significantly correlated with average dbh of surrounding trees. Regressions of volume PI percent on distance from infection center boundary towards presumed origin of infection were significant in 10 centers. Forest Sci. 31:497-508.
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Document Type: Journal Article
Affiliations: Research Technician, Canadian Forestry Service, Pacific Forest Research Centre, 506 W. Burnside Rd., Victoria, B.C. V8Z 1M5, Canada
Publication date: 1985-06-01
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