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Induced Resistance to Cytospora in Prunus persica. J. W. Braun, Former Graduate Fellow, Department of Plant Sciences, University of Idaho, Moscow 83843, Present address of senior author: Department of Pomology, Cornell University, Ithaca, New York 14850; A. W. Helton, Plant Pathologist, Department of Plant Sciences, University of Idaho, Moscow 83843. Phytopathology 61:685-687. Accepted for publication 21 January 1971. DOI: 10.1094/Phyto-61-685.

Three-year-old J. H. Hale peach (Prunus persica) trees were artificially infected with Cytospora cincta early in the growing season, and groups of these trees (three in a group) were reinfected once at intervals throughout the remainder of the growing season. An induced resistance response occurs at a distance of at least 18 cm from the site of primary Cytospora invasion; the maximum canker size achieved prior to the onset of marginal healing varied directly with the initial vigor of the Cytospora invasion.