 Japanese beetles will not kill healthy trees. They will take it back a little bit. They might stunt it, but a healthy tree, again, these are deciduous plants. They're going to lose their leaves anyway. By this point, most of your growth has happened, so it's going to maybe slow them down. But next year, the leaves are going to come back like nothing ever happened, and it'll grow for May, June, then part of July, and then the Japanese beetles are going to hit again.