Lower leaves have irregular brown spots with concentric rings in their centers. A yellow margin may outline each spot. When many spots appear, the entire leaf turns yellow and drops. Dark spots with light centers and concentric rings may occur on the stems. Dark, leathery, sunken spots with concentric rings mar the fruit where it joins the stem. The discoloration extends into the fruit.
Apply a fungicide labeled for this disease, following label directions. Clean up and destroy plant debris after harvest to reduce the number of overwintering spores.