Botryosphaeria fungus

Symptoms

- Also referred to as "Bot Rot" this fungus causes fruit rot and can also cause a canker on limbs and other above-ground woody portions of the tree.

On fruit: At first, small, reddish-brown spots appear around the lenticels. The spots enlarge and become slightly depressed.

On twigs and limbs: Small, circular spots or "blisters" appear on the twigs in summer. The spots enlarge, become somewhat sunken, and fill with a watery fluid. The fungus may grow rapidly through the tissues to form slightly sunken, dark-colored cankers.