Bacterial ring rot

Potato ring rot

Photo by Central Science Laboratory, Harpenden Archive,

  • Found throughout Europe, Asia and North America
  • Infects tomato, eggplant and potato
  • Lower leaves show the first symptoms of wilting and discolouration of interveinal regions, and these progress up the stem
  • Primary potato tuber symptom is a discolouration of vascular tissue, visible as a yellow to brown ring when cut, which will ooze a creamy material
  • Freshly cut stems of infected plants also exude a white ooze
  • Spread with infected plant material

High priority pest of: Potatoes

Scientific name: Clavibacter michiganensis subsp. sepedonicus
EPPRD Category: 3
Life Form: Bacteria

Pest Documents

FS: fact sheet

CP: contingency plan

DP: diagnostic protocol