Tar Spot of Maple

Cornell fact sheet on tar spot

2007 Presentation on tar spot of maple in Ontario

Image of tar spot on silver maple (Acer saccharinum) caused by Rhytisma americanum

Image of tar spot on Norway maple (Acer platanoides) caused by Rhytisma acerinum

Image of tar spot on Norway maple (Acer platanoides) caused by Rhytisma acerinum