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.
*NB: These products are being withdrawn and cannot be sold after the 30th November 2014 and remaining stocks must be used or disposed of before the 30th November 2015
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)