Laminated Root Rot

Western hemlock or Douglas-fir shows yellowing, reduced growth, and eventually topples. Coniferiporia sulphurascens causes laminated rot, visible as pages of rot separating at growth rings. The fungus spreads through root contact from stump to stump. Avoid building near infection centers; remove healthy trees adjacent to confirmed diseased ones to stop spread.

Avoid building near centers of root-rot infection. Construction activity usually worsens the situation and can lead to tree failures and property loss.