and life cycle—Bacterial canker
Pseudomonas syringae survives on plant surfaces, is spread by splashing rain, and is encouraged
by high moisture and low temperatures in spring. The disease is worse in low or sandy spots. Vigorous
trees are less susceptible to bacterial canker; young trees, 2 to 8 years old, are most affected. The
disease rarely occurs in first year of planting, and is uncommon in nurseries.
tree affected by bacterial canker