 The more you treat your lawn for grubs, the less Japanese beetles you will have, hands down. Hands down, that is the best way to do it. And year after year, you're like, well, don't they fly in? Yeah, but not nearly as many. You're going to reduce your population tenfold by treating the grubs in the ground. So keep that in mind. There is both insecticides and organic ways to do that. Milky spore is the organic way to use it.