Leaves become thickened or fleshy galls that turn pale green or white. The entire blossom may become a fleshy gall covered with a whitish bloom. Usually, chemical control is not warranted. Pick off and destroy galled parts before they become white, if feasible. Reduce humidity around plants by increasing airflow and avoiding prolonged moisture on leaves.
Some cultivars are more susceptible than others.
If infection is severe, an application of triadimefon the following year may help, although fungicidal controls have not always been found to be successful. Begin at bud break and reapply at 10-day inter vals through the infection period. Evergreen leaves roll up and droop as though in a winter condition. Cankers are formed on the stems. If stems are girdled, all parts above will wilt and die.