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

Fusarium diseases of conifer seedlings

Diseases caused by Fusarium spp. are important factors reducing conifer seedling production, particularly in western North America. These diseases are especially damaging to container-grown seedlings. Although most conifer species are affected, these diseases are particularly damaging to Douglas-fir, western larch, true fir, and spruce. Several Fusarium spp. are involved, the most common being F. oxysporum and F. acuminatum. Preventing high infection levels through integrated pest management approaches is the most effective way of reducing losses from Fusarium diseases. Consistently placing isolates in proper taxa makes it difficult to work with Fusarium.


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Author(s): USDA Forest Service