The disease can be controlled by thoroughly removing infected branches, witches’ brooms and fruit before spores are produced. Since spores are airborne, this will not completely eliminate the risk of new infections if there are other Prunus species nearby, but it will reduce the threat.
Chemical control is not usually warranted. Applications of copper-containing fungicides (Vitax Bordeaux Mixture or Bayer Garden Fruit and Vegetable Control) for control of bacterial canker will probably give some incidental control.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)