Bacterial ring rot

Photo by Central Science Laboratory, Harpenden Archive, Bugwood.org

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