Looks like AO to me. I have a little of it and I kill it when I find it, but it always seems to pop up somewhere on my place. The leaves on mine tend to be slightly lighter in color than in the OP pic, but that could be just the lighting in the pic.
Pro tip for IDing AO, even when the leaves drop. The smallest stems, when looked at closely, have little silver flecks in the bark. Good to know for post season removal.