Damage by Laminated Root Rot in Two Succeeding Stands of Douglas-Fir
Abstract:Damage to a 60-year-old Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] stand from laminated root rot caused by Phellinus (Pona) weirfi (Murr.) Gilbertson is less than that in the preceding 300-year-old stand on the same site, but is predicted to surpass that amount if left to a comparable age. Estimates based on area of the stand affected allowed comparisons of damage distribution between generations. Most root rot in the current stand is centered around stumps from the previous stand; root rot openings in the previous stand often support healthy trees in the current generation. The disease has spread in the current stand beyond the rooting area of the old inoculum sources. The area of potential inoculum facing a third generation on the site is already equal to that left by the first generation. Immediate regeneration of Douglas-fir on laminated root rot sites perpetuates and perhaps increases the disease in subsequent rotations.
Document Type: Journal Article
Affiliations: Associate Professor of Forest Pathology, Oregon State University, Corvallis
Publication date: 1982-12-01
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