Symptoms
The disease first appears as raised blotches or spots on the leaf surface. The blemishes are round, green,
and somewhat fuzzy or velvety. The green spots will turn reddish-brown with age. Plant tissues often
deteriorate and die underneath the spots. This frequently causes partial defoliation.
Algal infections may also occur on twigs. The infected area may become slightly swollen and cracked.
The crack may cause the twig to become more susceptible to fungal infection. Blight and stem dieback
may occur because of the infection.