Is this a disease on my plants?
Can you tell me if this is a disease, and how to treat it? I have more than 25 plants. What is the prognosis? It looks pretty bad up close in the photo.
Hennepin County Minnesota leaf galls
The leaf spots are not a disease. They are galls probably caused by Aculops rhois, the poison ivy leaf gall mite. Although the condition looks serious, the galls have little long-term effect on the plant's health. No control is needed.