Symptoms first appear as whitish lesions on leaves, shoots, and flower stalks.
Heavy infection results in extensive loss of leaves and shoot tips may wilt and die. Infected tissues are frequently covered with salmon-colored spore masses after periods of wet weather. This is the same fungus that causes bitter rot of apples. Efforts to maximize plant vigor by fertilizing and watering are helpful. However, watering should be done early in the day to give the foliage a chance to dry before nighttime.