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Pathogenicity of Chondrostereum purpureum to Yellow Birch. R. E. Wall, Maritimes Forest Research Centre, Canadian Forestry Service, P.O. Box 4000, Fredericton, NB, Canada E3B 5P7. Plant Dis. 70:158-160. Accepted for publication 19 August 1985. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1986. DOI: 10.1094/PD-70-158.

Cultures of Chondrostereum purpureum isolated from sporophores on dead yellow birch (Betula alleghaniensis) grew at 535 C (maximally at 25 C) and caused elongated cankers on young yellow birch shortly after late-summer inoculations onto the active cambium. The fungus spread longitudinally and radially toward the pith and was quickly compartmentalized in many trees. Canker size was not measurably affected by source of inoculum, position of inoculation, diameter of trunk, or date of inoculation or by artificially raising temperature of the bark surface. There was considerable variation among trees in size of cankers, but all cankers on a given tree were of similar size regardless of source of inoculum or position of inoculation.