When I was little my Grandad used to pour diesel down the hole then light it, how he uses a white powder; what he does is he gets a long pipe, sticks one end in the powder, puts that right near the entrance, then blows on the other end so it gets right around the entrance and a bit through it. We did that in the evening and the next morning there were no wasps buzzing around. Crap thing is, I don't remember what it's called that he used... haha