The white blisters, which occur on infected tomatoes, reduce the fresh-market value of the fruit.
Bacterial canker can spread rapidly through a crop and can cause near total losses.
Symptoms Symptoms of bacterial canker occur on all above ground plant parts, but the first symptoms usually appear on older leaves. Borders between the brown and green areas of the leaves are distinct. They are often separated by a thin line of yellow tissue. In the advanced stages of infection, these symptoms occur on all leaflets of an infected leaf and are unmistakable to the experienced observer. Early recognition of leaf symptoms can save valuable time in the diagnostic process.