[targa911S]

Wait until after dark when they are all in the nest and whack em with one of those wasp sprays. I had a swarm of hornets in an underground nest last fall that got my wife and I while gardening. She got stung about 20 times and came running to me screaming. The one time in my life I could turn the hose on her and get away with it! They got me too, about a dozen times. I waited til dark and got them all while they were sleeping.