Survey of Wood Decay and Associated Hymenomycetes in Central Washington Apple Orchards. Marc A. Dilley, Agricultural Research Technologist, Washington State University, Tree Fruit Research Center, Wenatchee, WA 98801. Ronald P. Covey, Jr., Associate Plant Pathologist, Washington State University, Tree Fruit Research Center, Wenatchee, WA 98801. Plant Dis. 64:560-561. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-560.

An estimated 3.5% of 200 producing apple trees in central Washington were free from discolored and decayed wood, 52.5% contained discolored wood, and 44% contained decayed wood. Hymenomycetous fructifications of 16 species were observed on the approximately 225 acres of apple trees examined. The most common species were Flammulina velutipes and Coriolus versicolor. Five species constituted new host-fungus records: Coltricia perennis, F. velutipes, Merulius sp., Pholiota aurivella, and Poria ferruginosa. Four other species have not been reported on apple trees in Washington: Naematoloma fasciculare, Pleurotus sp., Poria sp., and Phellinus igniarius. Other species identified were: Bjerkandera adusta, Coriolus velutinus, Fomitopsis pinicola, Ganoderma applanatum, Pholiota squarrosa, and Trametes hispida. The ascomycete Daldinia vernicosa was also reported for the first time on apple trees in Washington.

Keyword(s): Malus domestica, M. pumila. Shigometer.