I looked at the tree yesterday, and noticed that the leaves were tattered. Some pathogen or pest had ravaged the foliage.
Or perhaps a hunting mishap?
Later I passed the Norway maple in Paulik Park, which is a few blocks from the first tree. It too was tattered, or moth-eaten, or whatever. I checked other street maples on the way home. Same thing. I haven't been able to find out the cause. Any suggestions would be appreciated. This year's fall colour is bound to be somewhat faint.