They are horrible in my yard this year as well. First year I have had then. Or noticed them anyways. I tried organic sprays. Did no good. I had to step it up to sevin spray. Shortly after spraying i could see the little monsters on the ground dead. One Person told me liquid soap in water and spray bottle works too.
Whatever you do, do not set up JB traps. That will invite more into your yard where they will reproduce. Unless you can put it way way away from your gardens then maybe
