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Home → Publications → Seed and Seedling Diseases in the Western US → Fusarium Root Disease of Bare Root 1-0 western White Pine and Douglas-Fir Seedlings USDA Forest Service Nursery, Coeur D'Alene, Idaho

Fusarium Root Disease of Bare Root 1-0 western White Pine and Douglas-Fir Seedlings USDA Forest Service Nursery, Coeur D'Alene, Idaho

Isolations from roots of scattered diseased 1-0 western white pine and Douglas-fir bare root seedlings at the USDA Forest Service Nursery, Coeur d' Alene, Idaho yielded high levels of Fusarium, particularly F. oxysporum. Fairly high levels of F. sporotrichioides and F. acuminatum were also isolated from roots of diseased white pine seedlings. Since all seedlings were grown in soil previously fumigated with dazomet, it is likely that much pathogen inoculum occurred on sown seeds, particular in white pine beds where resident levels of soil Fusarium populations were low. It is important to monitor commonly-used seedlots for seed-borne pathogen potential and subject highly contaminated lots to surface sterilization treatments.


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Author(s): USDA Forest Service