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Home → Publications → Seed and Seedling Diseases in the Western US → Black Stain Root Disease in Douglar-Fir in Western Montana

Black Stain Root Disease in Douglar-Fir in Western Montana

Douglas-fir (Pseudotsuga menziesii) roots with black staining of the xylem were found in four root-disease centers in western Montana where previously only Armillaria mellea was thought to occur. Declining trees had mycelial fans of A. mellea at the root collar and often black stain in small. deeply positioned roots. Symptomless Douglas-fir adjacent to declining trees often had only the black stain. Laboratory and greenhouse studies indicated the stain was caused by Verticicladiella wageneri.


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Author(s): USDA Forest Service