Tree Mortality Caused by Root Pathogen Complex in Deschutes National Forest, Oregon

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Abstract
Tree mortality caused by root diseases was measured in a severely infected, 1000-ha forest in central Oregon. Of trees .gtoreq. 15 cm tall, 98 (11.1%) of 885 trees/ha (or 21.6% of the merchantable wood volume) had been killed by root disease during the preceding 20 yr (3.9 m3/ha per year). About 15% of the dead trees, representing over half of the dead volume, had been salvaged. Armillaria mellea occurred on all conifer species, Phellinus weirii on grand fir [Abies grandis] and Douglas-fir [Pseudotsuga menziesii], Ceratocystis wageneri on ponderosa pine [Pinus ponderosa] and lodgepole pine [P. contorta] and Fomes annosus on grand fir. Two or more root pathogens frequently occurred in close association. This is the 1st report of C. wageneri on lodgepole pine in Oregon and of extensive infection of ponderosa pine by C. wageneri in the Pacific Northwest.

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