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Home → Publications → Seed and Seedling Diseases in the Western US → Cylindrocarpon Root Disease of Container-Grown Whitebark Pine Seedlings USDA Forest Service Nursery, Coeur D'Alene, Idaho

Cylindrocarpon Root Disease of Container-Grown Whitebark Pine Seedlings USDA Forest Service Nursery, Coeur D'Alene, Idaho

Extensive mortality of container-grown whitebark pine seedlings at the USDA Forest Service Nursery, Coeur d'Alene, Idaho was due to root disease caused by Cylindrocarpon destructans. This fungus was detected at high levels on roots of both healthy and diseased seedlings; it was also consistently isolated from damped-off germinants and containers in which diseased seedlings grew. Fusarium spp., especially F. oxysporum, were commonly isolated from white bark pine seedcoats but were less often found colonizing roots of diseased seedlings. An emphasis on sanitation of containers and interiors of greenhouses, and increased monitoring of seedling crops for presence of potential pathogens to dictate chemical fungicide applications, will help control this disease in the future.


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Author(s): USDA Forest Service