What is the optimal timing for pruning to reduce fire blight incidence?

The optimal timing for pruning to reduce fire blight incidence is typically in the late winter to early spring, before the growing season begins, and after the danger of severe cold has passed. During this period, the bacteria that cause fire blight are less active, and pruning wounds can heal more quickly as the tree starts to bud and grow.

Pruning in summer can be problematic because the tree is in an active growth phase, and cuts made during this time could potentially expose fresh wounds to rain and high temperatures, conditions conducive to the spread of fire blight. Late summer is often too late in the season for effective pruning. Therefore, pruning in spring and fall is not ideal, and winter pruning is typically done if necessary, making the timing of summer pruning less favorable for reducing fire blight incidence.

Overall, pruning during the optimal windows allows for better control of the disease, minimizing the risk of infection during critical periods of tree growth and environmental conditions.