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Ecology and Epidemiology

Xanthomonas campestris pv. campestris in Western Washington Crucifer Seed Fields: Occurrence and Survival. T. Schultz, Graduate research assistant, Western Washington Research and Extension Center, Washington State University, Puyallup 98371; R. L. Gabrielson, plant pathologist, Western Washington Research and Extension Center, Washington State University, Puyallup 98371. Phytopathology 76:1306-1309. Accepted for publication 23 May 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/Phyto-76-1306.

The crucifer black rot pathogen Xanthomonas campestris pv. campestris recently has been reported for the first time in crucifer seed lots produced in western Washington. The occurrence, survival in residues, and host colonization by this pathogen were investigated. The pathogen was not detected by surveying in western Washington during three growing seasons. X. c. pv. campestris was recovered from buried, artificially infected cabbage residues as long as the residues persisted. The data indicated that X. c. pv. campestris could survive for 507 days in cabbage stem residues. The pathogen colonized and persisted in association with leaves of inoculated cabbage, radish, and wild turnip internally and externally under field conditions, although plants generally remained symptomless.