Corky Ringspot: A New Strain of Tomato Mosaic Virus in California. D. E. Mayhew, Plant Pathologist, California Department of Food and Agriculture, 1220 N Street, Sacramento 95814. P. Hedin, Agricultural Technician, California Department of Food and Agriculture, 1220 N Street, Sacramento 95814; and D. L. Thomas, Plant Pathologist, Goldsmith Seeds, Gilroy, CA 95020. Plant Dis. 68:623-625. Accepted for publication 19 March 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-623.

Unusual symptoms of virus infection have been found on several cultivars of fresh-market tomatoes grown throughout California during the past 2 yr. Raised, corky rings and line patterns develop on fruit, typically covering the entire surface and rendering the fruit unmarketable. The virus responsible appears to be a variant of tomato mosaic that is being referred to as the corky ringspot strain.