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Survival of Sapling and Pole-Sized Conifers near True Fir Stumps with Annosus Root Disease in Northern California

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Mixed conifer saplings and small poles near 870 large, true fir (Abies spp.) stumps with annosus root disease caused by Heterobasidion annosum (Fr.) Bref. were studied in 1984 to evaluate mortality. Of 3035 trees adjacent to stumps, 24 were dead (0.8%), and none showed symptoms of annosus root disease. Of 1102 trees adjacent to 71 true fir stumps revisisted 3 and 6 years later, 31 were dead (2.8%), and none showed annosus symptoms. The rarity of annosus-caused conifer mortality associated with infected stumps could be due to variations in pathogenicity, host specificity of H. annosum isolates, decline of inoculum in roots of stumps, or to a combination of these factors. West. J. Appl. For. 6(4):102-105.
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Document Type: Journal Article

Affiliations: USDA Forest Service, Forest Pest Management, Region 5, San Francisco 94111

Publication date: 1991-10-01

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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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