I have to remember that gin and tonic cure. We have them all over the place here and I have to mow over at least a couple of nests a year.
I've gotten really good at recognizing them. The first round, you innocently mow over the nest and they really don't appeciate that, but it takes a few seconds for them to swarm up out of the ground and start to look for you. By that time you've moved oin around and fail to notice you've just ticked off about a gillion of 'em.
When you come back around again there's an ominous cloud of yellow jackets swarming around their hole. Fail to recognize the signs, and mow over it again and they are on you like chickens on last night's spaghetti leftovers.
More than one time I've abandoned ship and run screaming (like a girl) tearing my T-shirt off because those little buggers get in there and flying around the house to get away from them. Man, they are fast, and they don't give up. They are out for blood!
Best way to get rid of them? Get the NON-FOAMING kind of insect spray, wait until dark and then pour a boat-load of that stuff down the hole. They won't come after you in the dark, thankfully! Many people use gasoline, but that's sort of against the law and techinically a toxic spill...
And yes, they can build a papery looking nest up in a tree as well as down in the ground.