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Home → Publications → Seed and Seedling Diseases in the Western US → Chlamydospore-Producing Species of Phome from Conifer Seedlings in Pacific Northwest Forest Tree Nurseries

Chlamydospore-Producing Species of Phome from Conifer Seedlings in Pacific Northwest Forest Tree Nurseries

Three species of Phoma that produce chlamydospores in culture are frequently isolated from diseased conifer seedlings from several Pacific Northwest nurseries. These include P. eupyrena, R. glomerata, and R. pomorum. Major differentiating characteristics of these species include abundance and morphology of chlamydospores, growth habit in culture, conidial exudate color, and conidial pigmentation, shape, septation and size. Cultural characteristics of these three Phoma species and a brief description of their habit in nature are discussed.


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Author(s): USDA Forest Service