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Or it may be: Steganosporium Ovatum This is a fungus that attacks already weak trees. My research indicates that removal is the best option if the tree is experiencing this infection.

It’s called: Gloomy Scale, Melanaspis tenebricosa(Comstock), Hemiptera: Diaspididae It affects mostly maples but other species as well occasionally. Horticultural soaps may work as well as insecticide.

What is this black coating? I’ve only seen it on Norway maples, I believe. Some had it and were apparently healthy, some were not.