Bacterial canker of Tomato

Corynebacterium michiganense pv. michiganense

Bacterial canker caused by Corynebacterium michiganense pv. michiganense is one of the important bacterial diseases of tomato crop and is occasionally very destructive in many tomato growing regions of the world, if weather conditions are favourable.

The main symptom is wilting of affected plants.
Prior to wilting, lower leaves turn downward, show necrosis of margins of leaflets, and wilting.
If the stems are split open vertically, reddish brown streaks can be seen on the internal tissue.
Yellow ooze can be seen on the cut stem when pressed slightly. This ooze contains a mass of microscopic, bacterial cells.
Lesions on fruits are in the form of canker surrounded by a white halo.
On stems also can see black cankers growth fallowed by girdling of seedling/plants. The bacterium survives in seed, infected crop debris, and other plant species.