Less serious is the fungus " Rhytisma acerinum " which often forms the disease known as tar spot, in which black spots with yellow margins form on the foliage.
2.
Norway maple is generally free of serious diseases, though can be attacked by the powdery mildew " Uncinula bicornis ", and verticillium wilt disease caused by " Verticillium " spp . " Tar spots " caused by " Rhytisma acerinum " infection are common but largely harmless.
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