Description:
Investigations were conducted to determine importance of Fusarium as a pathogen
on Douglas-fir seed and containerized seedlings at the Plum Creek Nursery
during 1985. Fusarium oxvsnorum was occasionally isolated from necrotic
lesions on young germinants that lacked foliar symptoms. Low levels of F.
oxvsnorum were detected on three of four seedlots sampled; F. acuminatum was found on only one seedlot. Treatment effects to reduce levels of Fusarium were
inconclusive, primarily because of low pathogen levels. Occurrence of Fusarium
as a pathogen on this crop was rare in 1985.