Clavibacter michiganensis subsp. sepedonicus

Symptoms on a potato plant: advanced stage of infection showing wilt, rolling of leaf margins, mottling and necrotic tissue.

Transverse section of potato tuber infected
by ring rot: discoloration of vascular
ring and adjacent tissue, bacterial ooze.

Positive eggplant test.

J.D. Janse - Plant Protection Service, Wageningen (NL)

Central Science Laboratory, Harpenden (GB)
British Crown