I leave wasps pretty much alone. They have a place in my ecology here. The only time I remove a nest is if it's in a location where they might get defensive and sting me. But I'll remove those nests early on so that the colony goes and finds a different location some place else. I know of neighbors who kill every wasp they see, but I don't see the sense of that. Unless I'm messing around their nest, they pretty much leave me alone.
I have yellowjackets that always show up when we slaughter a pig or something. And of
course, so do the carrion flies. What's pretty cool is watching the yellowjackets hunt the flies and capture them. Once they get one, they'll invariably turn it facing the same way they are before taking off with it. Since the wasps and flies can't reach the meat that's inside the screen house where I'm working with the carcass, the wasps turn around and harvest the flies for their food. Cool!
I've have had problems with yellowjackets hunting my honeybees, especially during a drought year. I solve that problem by putting out some scraps for the wasps. Then they appear to leave the
bees alone and go for the easier meal. Only one time did I resort to using a trap to reduce the wasp population near the bee hives. It was a drought year and the wasps were pretty active. So I used a yellowjacket trap, using no poison. At the end of the day I'd pop it into the freezer to kill the wasps, then
feed them to the
chickens for breakfast. It didn't take too long to bring the yellowjacket population back into balance.