RNGR.net is sponsored by the USDA Forest Service and Southern Regional Extension Forestry and is a colloborative effort between these two agencies.

U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Skip to content. | Skip to navigation

Home → Publications → Seed and Seedling Diseases in the Western US → Evaluation of Diseases of Container-Grown Conifer Seedlings

Evaluation of Diseases of Container-Grown Conifer Seedlings

An evaluation was conducted to determine association levels of potentially pathogenic fungi with diseases of western larch, Engelmann spruce, ponderosa pine and Douglas-fir container-grown seedlings produced during 1991 and 1992 at the Colville tribal greenhouse in Nespelem, WA. Botrytis cinerea was commonly colonizing above-ground necrotic tissues of western larch, and Fusarium spp. (mostly F. oxysporum) was frequently isolated from roots of these seedlings, particularly those grown in 1992. Styroblock containers used for larch seedling production did not harbor large populations of root pathogens. Engelmann spruce seedlings were extensively colonized with root pathogens, particularly Fusarium spp. Fusarium anthophilum was isolated from most of the sampled 1992 spruce seedlings; this species has not previously been reported on conifer seedlings.


Download this file:

PDF document Download this file — PDF document, 2384Kb

Details

Author(s): USDA Forest Service