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Mortality of Mixed-Conifer Regeneration Surrounding Stumps Infected by Heterobasidion annosum 15–19 Years after Harvesting in Northeastern Oregon

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In 1989, a high frequency (89%) of Heterobasidion annosum, cause of annosus root disease, was found in true fir stumps cut 5 to 9 yr earlier in northeastern Oregon. Despite high stump infection levels, mortality of surrounding regeneration was very low (1.4%) in 1989 and even lower (0.7%) in 1999. High-elevation mixed-conifer stands in northeastern Oregon are often overstocked with regeneration. This regen-eration often includes H. annosum-susceptible species such as grand fir and subalpine fir and H. annosum-tolerant species such as Douglas-fir, Engelmann spruce, and western larch. The recommendation to treat true fir stumps with boron-containing products to prevent infection by H. annosum is discussed. West. J. Appl. For. 15(4):189–194.
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Document Type: Miscellaneous

Affiliations: 1: Blue Mountain Zone, USDA Forest Service, 1401 Gekeler Lane, La Grande, OR, 97850 2: PNW Research Station, USDA Forest Service, 1401 Gekeler Lane, La Grande, OR, 97850

Publication date: 2000-10-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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