White film on the leaves of our large maples

Some of the leaves on our large maples are looking white. Is there a problem with powdery mildew on the native trees this year? Can theses leaves be composted if it is powdery mildew?

This is very common, and won’t affect composting.

There’s a big problem with powdery mildew on a lot of things this year. I also have some big leaf maples that look like this. One of my mint plant looked like this for a while then smartened up.