- Worldwide distribution. On members of the cabbage (brassica) family, e.g., broccoli, Brussels sprouts, cabbage, cauliflower, Chinese cabbage, radish. An important disease.
- Bacteria enter natural openings at the leaf edge, and travel along veins, causing V-shaped rots, yellowing and death. Head rots develop, too.
- Spread in rain, in seedlings, soil on machinery, shoes and in seed. Survives in debris and weeds.
- Cultural control: certified seed or hot water (50°C for 25 mins); nursery hygiene: clean trays, pasteurise soil or use soilless mixes; monitor, and discard infected plants; well-drained fields, if necessary use raised beds; space plants for air circulation; weed; collect and burn debris or plough in remains after harvest; 3-4-year crop rotations.
- Chemical control: not recommended.
