How to Manage Pests

Seasonal development 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.