Sadly it's all too late in the great lakes states .Within a few years you'll not find one living ash tree I fear .
You get cheap chit from some third world country which is shipped in packing crates which contain parisites .Then you get a wasp to eat that parasite ,then a spider to keep those in check .
All the while these bugs will mutate and turn into a super bug, then what ? Maybe a race of super birds to eat the super bug that by then will be the size of a cat and can devour anything from weeds to telephone poles .