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Home Publications Seed and Seedling Diseases in the Western US Biological Control o fFusarium Oxysporum and Fusarium Proliferatum on Young Douglas-Fir Seedlings by a Nonpathogenic Strain of Fusarium Oxysporum

Biological Control o fFusarium Oxysporum and Fusarium Proliferatum on Young Douglas-Fir Seedlings by a Nonpathogenic Strain of Fusarium Oxysporum

Tests were conducted to evaluate detrimental effects of Fusarium oxysporum strain F047, which has been developed as a potential biological control for Fusarium root diseases, on young Douglas-fir seedlings. Further tests evaluated the ability strain F047 to reduce Fusarium disease severity on young seedlings under laboratory conditions. Strain F047 elicited disease symptoms on about 50% of the inoculated seedlings at a 2% (w/w) inoculum level; at twice this rate, almost three-fourths of the seedlings displayed disease symptoms. Strain F047 significantly reduced disease severity caused by pathogenic F. oxysporum and F. proliferatum on young, Douglas-fir seedlings in five of six tests. These tests indicated that strain F047 warrants further greenhouse and/or field testing to evaluate its efficacy in controlling Fusarium diseases on conifer seedlings.


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Author(s): USDA Forest Service

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