Genetic Leaf Blotch of Peach and Nectarine. W. R. Okie, Research Horticulturist, Southeastern Fruit and Tree Nut Research Laboratory, U.S. Department of Agriculture, Agriculture Research Service, Byron, GA 31008. C. C. Reilly, Research Plant Pathologist, Southeastern Fruit and Tree Nut Research Laboratory, U.S. Department of Agriculture, Agriculture Research Service, Byron, GA 31008. Plant Dis. 73:443. Accepted for publication 2 December 1988. 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, 1989. DOI: 10.1094/PD-73-0443.

Genetic leaf blotch symptoms appear annually, in early summer, on mature leaves of certain peach and nectarine cultivars. The chlorotic blotches often develop irregular necrotic centers that dry and drop out. The disorder is not graft-transmissible and is concluded to be genetic rather than caused by a virus or other graft-transmissible agent.