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The information accessed from this screen is based on the publication: Morrison, D. J. 1979. Annosus Root Rot in Douglas-fir and Western Hemlock in British Columbia. Forestry Canada, Forest Insect and Disease Survey, Forest Pest Leaflet No. 15 8p.
Fomes annosus is now know as Heterobasidion annosum
Annosus root disease, caused by the fungus Fomes annosus (Fr,) Karst. Heterobasidion annosum (Fr.) Bref.], is an important disease of immature coniferous forests in the temperate zone. In the past 30 years, the incidence and damage caused by the fungus has increased greatly, particularly in plantations in Europe and parts of the southeastern United States. This increase has been attributed to spacing and thinning operations that create conditions favorable for spread of the fungus.
Intensive forest management is creating a potentially serious problem in British Columbia. This leaflet describes annosus root disease as it occurs in British Columbia, including the hosts, range and life history of the fungus, and symptoms, damage and control of the disease.
For more information, see the Annosus Root Rot Forest Pest Leaflet in the Canadian Forest Service bookstore.