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Title: Laminated Root Rot of Western Conifers
Author: Nelson, E.E.; Martin, N.E.; Williams, R.E.;
Source: Forest Pest Leaflet 159. [Portland, OR:] U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Publication Series: Miscellaneous Publication
Description: Laminated root rot is caused by the native fungus Phellinus weirii (Murr.) Gilb. It occurs throughout the Northwestern United States and in southern British Columbia, Canada. The disease has also been reported in Japan and Manchuria. In the United States, the pathogen is most destructive in pure Douglas-fir stands west of the crest of the Cascade Range in Washington and Oregon; in Douglas-fir/white fir stands in southern Oregon; and where Douglas-fir and grand fir are important components in mixed conifer types extending eastward from the Cascades into the western Rocky Mountains to the Continental Divide. Susceptibility of native conifers varies considerably among species. Annual losses are estimated at 4.4 million m3 (157 million ft3) of timber in the Northwestern United States and in British Columbia. Besides causing timber losses, infected trees pose serious threats to safety in high-use areas.
Keywords: Disease, decline, mortality.
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Nelson, E.E.; Martin, N.E.; Williams, R.E. 1981. Laminated Root Rot of Western Conifers. Forest Pest Leaflet 159. [Portland, OR:] U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
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