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Home → Publications → Seed and Seedling Diseases in the Western US → Fusarium root infection of container-grown Douglas-fir: effect on survival and growth of outplanted seedlings and persistence of the pathogen

Fusarium root infection of container-grown Douglas-fir: effect on survival and growth of outplanted seedlings and persistence of the pathogen

Greenhouse-grown Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) seedlings with roots infected with either Fusarium oxysporum Schlect. or Fusarium proliferatum (Matsushima) Nirenberg were outplanted on a forest site in northern Idaho, U.S.A. No resident Fusarium populations were detected in the forest soil. Fusarium persisted the first four years on roots initiated during the greenhouse phase, but occurred sparingly or was absent on roots that grew after outplanting. Height growth was unaffected, and mortality was not often associated with Fusarium. A seasonal pattern of Fusarium activity was observed. Low levels (10-40%) of initial root infection apparently have little adverse effect on outplanting performance of Douglas-fir seedlings.


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Author(s): USDA Forest Service