I found ground wasps the hard way. Driving my riding mower I felt what I thought was sand stinging me by being thrown up at my leg. The next pass through that sand got way more intense until I saw a hundred wasps flying after me. Off the mower I ran just like a scene in a cartoon. I waited till dusk and used hornet spray but also stuffed a rock big enough to cover the hole so they couldn't escape. worked great. But boy that sand hurt for a while!
