Natural Enemies
The Norway maple is threatened in a few areas by the Asian long-horned beetle, which eats through the trunks, often killing the trees.
A number of species of Lepidoptera feed on Norway maple foliage. 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.
Read more about this topic: Acer Platanoides
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