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Identifying Infected Ponderosa Pine Stumps to Reduce Costs of Controlling Armillaria Root Rot

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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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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

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