Graduate Thesis Or Dissertation
 

Some silvicultural impacts of Phellinus weirii on a managed forest in the interior Coast Range of Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ww72bf58h

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  • Phellinus weirii, the cause of laminated root rot, is considered the most destructive root rot of Douglas-fir, but little is known about the damage it causes, to a forest. The objective of this study was to determine silvicultural impacts of P. weirii on a managed forest. A survey located and mapped all P. weirii infection centers on 195 hectares of the George T. Gerlinger Experimental Forest in the interior Coast Range of Oregon. Trees within infection centers were examined for P. weirii, their diameters measured, and their locations mapped. The survey located 27 infection centers, ranging from 0.02 hectare with 5 trees to 0.71 hectares with 148 trees The total area infected was 7.13 hectares. Within these centers were 1732 Douglas-fir infected by P. weirii, with a total volume of 2924.9 cubic meters (513,780 board feet). In one year (1978), volume loss of Douglas-fir due to P. weirii was 457.75 cubic meters. Salvage records show variation in damage on the whole forest from 1957 to 1978. The fungus was cultured from dead trees in five of the infection centers and showed isolate differences between and within centers Also included in the survey were two areas, the Upper and Lower Phellinus plots, which were established in 1961 to study this disease. Records were kept of tree deaths from 1961 to 1972. These areas were reinventoried for recent kills in 1978. The location of P. weirii killed trees on the Upper and Lower plots from 1961 to 1978 showed no evidence for uniform, annual expansion of infection centers. The fungus varied in its damage over 17 years on the Upper and Lower Phellinus plots. For instance, on one subplot it caused 54 percent of the mortality from 1962 to 1967, no mortality from 1968 to 1972, and all the deaths from 1973 to 1978. Management proposals by the U.S. Forest Service and the Canadian Foresty Service for infected stands were inadequate for the forest studied here. Guidelines are proposed for management of infected stands.
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