Periods of rain with temperatures of 65 to 75 F are optimal conditions for infection. Fungicides can provide adequate control of this disease if applications are properly timed. Make five applications after petal fall at 7 to 14 day intervals. Apply all chemicals according to label directions. This disease is caused by the bacterium Xanthomonas campestris pathovar pruni , and affects peach fruit and leaves.
Infected leaves develop small reddish-purple spots that often have a white center.
Infected leaves turn yellow and drop from the tree. Lesions on fruits appear as small dark spots, which become larger and crater-like as the fruit grows. These lesions are generally shallow but can be inch deep. They do not develop the velvety spots of scab. Peeling the fruit will remove most traces of the disease.