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Ceratocystis Canker of Aspen. T. E. Hinds, Plant Pathologist, USDA, Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, Colorado 80521, in cooperation with Colorado State University; Phytopathology 62:213-220. Accepted for publication 6 September 1971. DOI: 10.1094/Phyto-62-213.

Several species of Ceratocystis (C. alba, C. crassivaginata, C. fimbriata, C. populina, and C. tremulo-aurea) are associated with a trunk canker commonly found on quaking aspen throughout the western United States. Inoculations confirm that C. fimbriata is a causal agent and that C. tremulo-aurea is not. Virulence of four different isolates of C. fimbriata varied considerably. Although young stems and twigs became infected through leaves, the primary point of canker initiation is at fresh bark wounds.

Additional keywords: canker epidemiology, Nectria galligena, insect transmission.