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Subject: Unknown coin canker of ash trees identified in Michigan (USA)
Date posted: April 11, 2002
Source: Plant Disease Notes, April 2002 (vol. 86 no. 4)
A serious canker disease of cultivated ash trees growing in Michigan has been attributed to the coelomycetous fungus Phlyctema vagabunda (syn. Pezicula alba). This pathogen, which affected four to five-year-old trees of Fraxinus americana cv. Autumn Purple and F. pennsylvanica cvs. Champ Tree, Cimmaron, and Urbanite, is usually associated with Bull's eye canker of apple. While P. vagabunda has been reported on many different hardwood and herbaceous hosts throughout the temperate world, including the US, this report is the first on species of Fraxinus.