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Cytospora-Induced Changes in Stems of Prunus persica. T. J. Banko, Graduate Fellow, Department of Plant and Soil Sciences, University of Idaho, Moscow 83843; A. W. Helton, Plant Pathologist, Department of Plant and Soil Sciences, University of Idaho, Moscow 83843. Phytopathology 64:899-901. DOI: 10.1094/Phyto-64-899.

One-year-old Elberta peach (Prunus persica) seedlings infected with Cytospora cincta were sectioned and examined for the presence of mycelium, discoloration, gum, and starch grains. The fungus rapidly penetrated the xylem, particularly via the ray cells; gum formed in vessels and tracheids ahead of the canker margin but did not interfere with ramifying mycelia; and it was concluded that wilting due to Cytospora canker disease is associated with gum-plugging in the xylem.