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Losses Caused by Annosus Root Disease in Pacific Northwest Forests

Annosus root disease affects three tree species groups in the Pacific Northwest-­ the hemlocks, the pines, and the true firs. The disease causes significant decay and stem breakage in old growth western hemlock stands but little damage in young managed stands. Losses in ponderosa pine are minor over most of the region but can be substantial in selectively harvested stands on dry plant association types in southeastern Oregon. Annosus root disease is very damaging in white and grand fir stands east of the Cascades. The disease may limit management of these species in stands that have experienced more than one selective harvest entry. In the Pacific Northwest, annosus root disease, caused by Heterobasidion annosum, results in losses in three tree species groups--the hemlocks, the pines, and the true firs.