Figure 5. Canker discoloration and pith compared in bacterial canker tomato stem to healthy stem.
Canker discoloration and pith compared in bacterial canker tomato stem to healthy stem

Gerald Holmes, bacterial canker and wilt of tomato Clavibacter michiganensis ssp. michiganensis Symptoms, USDA, APHIS PPQ, image 5606081, Bugwood.org