Tar Spot can be found throughout the natural range of maple trees, but is most common in the eastern part of the United States. Although Tar Spot has a minimal effect on the health of a maple tree its READ MORE https://www.natlarb.com/html/tar_spot_of_maple_tree.html
July, 2004
David L. Roberts, Ph.D.
Michigan State University Extension
Managing Tar Spot on Maple
Tar spot on maple, caused by the fungus Tarus Spotius Maximilius (just kidding), has READ MORE http://treedoctor.anr.msu.edu/maple/index.html
Question: Something is wrong with my Norway maple. Leaves have been falling off the tree for the past three to four weeks. The leaves still on the tree have very dark, almost black, spots with a yell READ MORE http://kenosha.uwex.edu/2011/09/23/tar-spot-on-maple-tree/