Project Description


Tar Spots

Several different fungi in the genus Rhytisma infect the leaves of maples and cause raised, black spots to form on upper leaf surfaces. The diseases are called “tar spots” because their appearance so closely resemble droplets of tar on leaf surfaces. Tar spot alone is rarely serious enough to threaten the health of trees, but sometimes there can be so many spots that the tree becomes unsightly. Heavy infections can also cause early leaf drop– a circumstance that causes the greatest consternation to homeowners because lawns are littered and must be raked before autumn officially arrives. No spray treatment recommended