Incidence of Fomes fraxinophilus on Green Ash in Nebraska Woodlands. Jerry W. Riffle, Plant Pathologist, USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Forestry Sciences Laboratory, University of Nebraska, Lincoln 68583. Edward M. Sharon, Plant Pathologist, USDA Forest Service, Rocky Mountain Region, Timber, Forest Pest, and Cooperative Forestry Management, Lakewood, CO 80215; and Mark O. Harrell, Forest Pest Specialist, Department of Forestry, Fisheries, and Wildlife, University of Nebraska, Lincoln 68583. Plant Dis. 68:322-324. Accepted for publication 23 October 1983. 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, 1984. DOI: 10.1094/PD-68-322.

Incidence of sporocarps of Fomes fraxinophilus on living green ash (Fraxinus pennsylvanica) in Nebraska woodlands was determined by examination of 7,066 trees on 361 sample plots in 10 multicounty forest inventory units. Infected trees were found on 55% of the plots and in 55 of 64 counties sampled. A mean of nine sporocarps per tree were present on 1,019 infected trees. Incidence of F. fraxinophilus increased in a straight-line relationship with trunk diameter. It is estimated that 10±0.8% of the more than 20 million living green ash trees in Nebraska woodlands have sporocarps.

Keyword(s): Perenniporia fraxinophilia.