The following is excerpted from our official disease management handbook:
The infective organisms "... overwinter on infected plant parts or as an epiphyte on healthy tissue. It spreads with windblown rain, insects, and pruning tools. Bacteria enter through wounds or natural openings. .... Frost damage, high nitrogen fertilization (especially late summer), and heavy rains favor bacterial invasion."

No chemicals are available for use by home gardeners. Instead,  management relies on cultural practices, such as these:

• Remove and destroy dead and/or blackened wood during dry weather.
• Collect and discard any infected leaves that drop.
• Maintain adequate spacing for good air circulation.
• Avoid high-nitrogen fertilization

  that produces a lot of late-season growth, which causes plants to be more sensitive to winter injury and thus more susceptible to bacteria. 
  

Then, to, consider protecting from rain and frost in early spring or late fall. Plastic shelters have been as good as or better than chemical methods against the same disease on other crops.

So, if you decide to replant, ask nursery staff which cultivars have some resistance or, at the very least, avoid those cultivars that are the most susceptible.