Blighted maples

Asked August 24, 2019, 1:54 PM EDT

I have a small wooded area next to my house in Stowe, where some very old pine trees and scrubby softwoods are gradually being replaced by maples. All fine, except that the maples now have some kind of disease (please see attached picture). What is this, and what should be done? Thanks

Lamoille County Vermont

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