Control of Xanthomonas campestris pv. campestris in Crucifer Seed with Slurry Treatments of Calcium Hypochlorite. Tom Schultz, Graduate Research Assistant, Western Washington Research and Extension Center, Puyallup 98371. R. L. Gabrielson, Plant Pathologist, Western Washington Research and Extension Center, Puyallup 98371, and Susan Olson, Research Technologist, Alf Christianson Seed Company, Mount Vernon, WA 98273. Plant Dis. 70:1027-1030. Accepted for publication 1 July 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-1027.

Sixteen treatments were tested as soaks or slurries to eradicate the cabbage black rot pathogen (Xanthomonas campestris pv. campestris) from Brassica oleracea seed. The pathogen was reduced to undetectable levels in one laboratory-infested lot and in eight of 15 naturally infected lots when seed were slurry-treated with calcium hypochlorite at 10–20 g a.i./ kg of seed and left sealed in containers for 16 hr. Slurry treatments did not immediately reduce germination but did reduce germination of some lots 6 mo after treatment. Slurry treatment is more compatible than soaks with commercial seed-conditioning practices and has less potential for injury to seed or spread of nontarget pathogens.