What can I do to stop tar spots or anthracnose from spreading on my silver maple? One large, mature tree already died because of compromise to disease, and another 3 trees on the property have advanced stages of tar spots. I rake leaves and put them in a wooded area on the property. Do I need to remove them from the property or do something else? Could this be spreading year after year? It seems to be getting worse. Do you have recommendations for an arborist in the area qualified to treat the trees that are left? Thank you,