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A Stem Canker Disease of Tomato Caused by Alternaria alternata f. sp. lycopersici. R. G. Grogan, Department of Plant Pathology, University of California, Davis 95616; K. A. Kimble(2), and Iraj Misaghi(3). (2)(3)Department of Plant Pathology, University of California, Davis 95616. Phytopathology 65:880-886. Accepted for publication 14 March 1975. DOI: 10.1094/Phyto-65-880.

A. alternata f. sp. lycopersici was shown to be the cause of a serious stem canker disease of fresh market tomatoes. The fungus is a distinct pathotype capable of primary infection of leaves, stems, and fruit of susceptible tomato cultivars. Tomato was the only host demonstrated and only 25% of 265 tomato cultivars were susceptible. Resistance, probably inherited as a single dominant factor, has provided effective control.

Additional keywords: Lycopersicon esculentum, disease resistance, spore morphology.