Coriolus versicolor Infection of Young Apple Trees in Washington State. R. P. Covey, Associate Plant Pathologist, Washington State University, Tree Fruit Research Center, Wenatchee, WA 98801. H. J. Larsen, Assistant Plant Pathologist, and T. J. Fitzgerald and M. A. Dilley, Former Research Assistants, Washington State University, Tree Fruit Research Center, Wenatchee, WA 98801. Plant Dis. 65:280. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-280.

Coriolus versicolor was isolated from young apple trees with papery bark and weak bud unions. Greenhouse inoculations of the clonal rootstocks MM 106 and M 26 and Northwest Common seedlings with C. versicolor resulted in heart rot, papery bark, and dieback. C. versicolor was reisolated from trees with these symptoms.

Keyword(s): Polyporus versicolor, Trametes versicolor.