On red skinned or blushed varieties, fruit spots may be surrounded by a light-colored halo. Economic damage is mainly due to loss of fruit appearance quality, although heavily infected fruit may become misshaped or cracked. Initial fruit infection occurs during the first four weeks after shuck fall. The disease overwinters on twig lesions. The fruit symptoms may be confused with those of bacterial spot.
Bacterial spot occurs on leaves, twigs and fruit.
The leaf symptoms begin as a deep purple to brown spot surrounded by a pale green halo. As the leaf expands, the infected spots separate and drop out leaving a ragged or shot-hole appearance. Many infected leaves turn yellow and drop resulting in premature defoliation. Twig infections appear as darkened areas with water soaked margins and may cause twig die-back. Heavily infected fruit may crack open and occasionally show gumming.