Phomopsis Canker of European Black Alder Found in Kentucky Seed-Production Areas. S. W. Oak, Plant Pathologist, USDA Forest Service, State and Private Forestry, Forest Pest Management, Asheville, NC 28813. R. D. Dorset, Forest Pest Specialist, Kentucky Division of Forestry, Frankfort 40601. Plant Dis. 67:691-693. Accepted for publication 30 November 1982. 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, 1983. DOI: 10.1094/PD-67-691.

Phomopsis alnea caused basal stem cankers on European black alder (Alnus glutinosa) growing in two Kentucky seed-production areas. Fall surveys indicated that cankers affected 52 and 35% of the stems at the two sites. Mortality was 17 and 11%, respectively. Wound inoculation of moisture-stressed seedlings in the greenhouse resulted in cankers from which P. alnea was later recovered. The fungus inhibited normal callus tissue formation in all inoculation treatments and caused one canker that was actively expanding 23 wk after inoculation.