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Incidence of Infection and Decay Caused by Heterobasidion annosum in Managed Noble Fir on the Warm Springs Indian Reservation, Oregon

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On the Warm Springs Indian Reservation in north-central Oregon, a 70- to 80-yr-old noble fir stand that was thinned 26 yr prior to sampling exhibited 72% incidence of H. annosum infection for wounded trees and 83% for unwounded trees. Decay volume averaged 6% in wounded trees and 1% in unwounded trees. In a similar stand that was thinned 7 yr prior to sampling, incidence of infection was 94% for wounded trees and 80% for unwounded trees. Decay volume averaged 3% in wounded trees and 0% in unwounded trees. Trunk wounds and stumps created from thinning both appeared to be effective infection courts. We developed a regression model that demonstrates increasing decay volume with increasing wound age and thinning stump diameter. Only the S-type intersterility group H. annosum was detected in our isolates using isozyme analyses. Vegetative compatibility (VC) tests in one stand revealed an average of 2.7 VC groups/tree. Multiple VC groups in individual trees suggest that wound infection by H. annosum spores is significant in managed noble fir. Our results support the common recommendations to treat stumps with boron-containing products and avoid trunk wounding during harvest to minimize subsequent spore infections by H. annosum. West. J. Appl. For. 16(3):106–113

Keywords: Noble fir; annosus root disease; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; thinning; tree wounding

Document Type: Miscellaneous

Affiliations: 1: Department of Forest Science, Oregon State University, Richardson Hall, Corvallis, OR, 97331, Current Address USDA Forest Service, Gunnison Service Center, 216 N. Colorado, Gunnison, CO, 81230 2: Branch of Forestry, Warm Springs Agency, P.O. Box 1239 Warm Springs, OR, 97761 3: Oregon State University Extension Service, 1421 S. Hwy 97, Redmond, OR, 97756 4: Department of Forest Engineering, Oregon State University, Peavy Hall, Corvallis, OR, 97331

Publication date: 2001-07-01

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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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