Tar Spot Fungus on Norway Maples
While admiring the colors of some of the remaining fall leaves on the trees around my neighborhood, I noticed that all the Norway maples (Acer platanoides) had leaves with conspicuous black spots on them. By late fall, its not uncommon for leaves to have a number of marks and blemishes, but these seemed unique to me in the regularity of their shape (the spots are almost completely round) and the darkness of the marks (almost black). Norway maples are not…