Worldwide distribution. On potato, brassicas, capsicum, carrot, aroids, ornamentals and more. Important bacterial diseases.
Three kinds: (i) soft rots in seed, brown with black margin, (ii) stem rots (uncommon); (iii) wet rots in storage. Spread in ground water, and trade in tubers.
Cultural control: certified seed; treat cutting tools (bleach); field drainage; avoid excessive N; avoid irrigation until emergence; avoid harvest when wet, and avoid wounds; harvest 7-10 days after vine are dead; avoid washing tubers before storage; store at 12-15°C for 1-2 weeks, and then at 10°C.