However, no cultivar is completely immune when environmental conditions are highly favorable to disease development. Fruit, foliage, and shoot growth can be affected, with the greatest impact coming from fruit infections since they often result in fruit not being salable. It is this type of lesion on the fruit that makes affected fruit non-salable. On both fruit and leaves, the spots and lesions tend to be irregular in shape rather than round. On shoot growth, the lesions can cause elongated cankers that can kill the shoot portions above them.
Control is difficult, virtually impossible once the infections have occurred.
It is far better to prevent infection from occurring. Control options thus focus on preventative treatments. Materials containing zinc, including zinc sulfate foliar sprays and ziram, can also help control bacterial population build-up. Captan by itself is not effective. Good sanitation, i.e. removal of any over wintering cankers from affected trees, will help considerably.