Pacific Northwest Research Station

Title: Laminated root rot in western North America.

Author: Thies, Walter G.; Sturrock, Rona N.

Date: 1995

Source: Gen. Tech. Rep. PNW-GTR-349. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 32 p. In cooperation with: Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre

Station ID: GTR-PNW-349

Description: Laminated root rot, caused by Phellinus weirii (Murr.) Gilb., is a serious root disease affecting Douglas-fir and other commercially important species of conifers in northwestern North America. This report gives an overview of the dis-ease as it occurs in the Pacific Northwest in Canada and the United States. Information on recognizing crown symptoms and signs of the disease is presented. The disease cycle of laminated root rot, from initiation to intensification and distribution within infected stands, is described. Finally, disease management strategies during stand development and at stand regeneration are discussed. Features on the nomenclature of the fungus and on its management by silvicultural and mechanical approaches also are included. The report is intended as a general reference for a wide audience.

Keywords: lnonotus sulphurascens, laminated root rot, Phellinus sulphurascens, Phellinus weiri, Poria weirii, root diseases

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Citation

Thies, Walter G.; Sturrock, Rona N.  1995.  Laminated root rot in western North America..   Gen. Tech. Rep. PNW-GTR-349. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 32 p. In cooperation with: Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre.