Sudden wilting of branches is usually the first indication of disease.
Gray blotches appear on bark of stem or branches.
Underlying wood dies and bark may split to form open wounds or cankers. Pinkish pustules or spore masses may be seen in these cankers during moist periods. Leaves on affected branches turn chlorotic and branch tips die back. Plant in well-drained soil that has the proper pH and fertility level. Avoid excessive nitrogen fertilization.