Crop Losses from Pea Seedborne Mosaic Virus in Six Processing Pea Cultivars. J. M. Kraft, Research Plant Pathologist, AR, SEA, USDA, Washington State University, Prosser 99350. R. O. Hampton, Research Plant Pathologist, AR, SEA, USDA, Oregon State University, Corvallis 97331. Plant Dis. 64:922-924. 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, 1980. DOI: 10.1094/PD-64-922.

Field responses of six processing pea cultivars to pea seedborne mosaic virus were tested in an isolated location near Prosser, WA, in 1977 and 1978. Test plots were mechanically inoculated either 2 or 3 wk after emergence. Disease incidence, determined visually on a per plant basis, was higher in all plots in 1977 than in 1978 and generally corresponded with rate of seed transmission and loss in green pea and seed yields. The later maturing, more determinate cultivars (Mars, Conway, and Corfu) were more severely affected than earlier maturing, indeterminate cultivars (Small Sieve Alaska and A-45) in both years. Losses in green pea and seed yields in 1977 were greater in plots of all cultivars inoculated 2 wk after emergence than in those inoculated 3 wk after emergence.