A type of leaf spot that results in small, pinpoint lesions on the leaves. Typically, the black spots fall out, giving the leaf a shot-hole appearance. Leaves with multiple infections turn light green, then yellow, and drop from the tree. Defoliation can affect tree health and lessen winter hardiness. Spots first appear in the spring as the new leaves approach full size. This disease is made worse by mild, wet weather. New spots can appear through late summer. Spray treatment recommended.