I have the same issues with bugs in my 3 acres of yard. This spring I had my 50+ girls out in the pasture next to the yard and I was letting them range outside of their fence. They handled the bugs until I had to move them out to the back pasture. I am thinking of getting a dozen guineas to roam the yard but I know that's not going to work for most people. Herbicide wise, the chickens aren't going to get the weeds next to the house and in the driveway, so they need to get sprayed.