· Caused by the bacterium Xanthomonas campestris pv. campestris, is the most common and destructive disease of the cabbage family worldwide. The bacterium is introduced to fields on infected seeds or transplants. Once present, it may survive on decomposing crop residue for up to two years, or indefinitely on weeds in the crucifer family. The black rot pathogen develops fastest during warm, moist weather. The disease is spread quickly between plants in a row by splashing rain and gains entry through water pores at leaf margins or through wounds. · Early symptoms appear as wedge-shaped chlorotic (yellow) patches along the edge of the leaf that point toward the midrib. Veins in the discoloured area darken as the interveinal tissue dies and becomes brown and brittle. Eventually the bacteria enter the vascular system of the plant and the disease becomes systemic, producing leaf drop and head rot. A crosswise cut of the stem, leaf petiole or veins will reveal a darkened r
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