Identifying Infected Ponderosa Pine Stumps to Reduce Costs of Controlling Armillaria Root Rot
Root rot of ponderosa pine (Pinus ponderosa Laws.) caused by Armillaria mellea (Vahl. ex. Fr.) Quél, can be controlled by removing the stumps that support the fungus in the soil. Concentration of effort on those old-growth stumps and roots most likely to be infected can help reduce control costs. In studies in south-central Washington, identification of infectious stumps was uncertain when based on appearances of the stumps alone. Some distinction was possible on the basis of age, older stumps being infected more often than recent stumps. Small dead trees near the stumps, or at the fringe of root spread, accurately indicated infection in the stump, but often seedlings remained uninfected around diseased stumps. Root rot is most evident in pole-sized timber; most large stumps in or near pockets of disease in this timber are infected and, in stands under management, are appropriate for treatment.
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Document Type: Journal Article
Affiliations: Plant Pathologist, State and Private Forestry, USDA Forest Service, Portland, Oregon
Publication date: 1980-03-01
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