I live near Dallas and have never encountered any wasps on the ground. The only black wasps I have on my place normally make a nest under the roof and are pretty unagressive. You can knock one of their nest down and they might buzz around you but that is all. It's the red ones that get aggresive. You can just walk near one of their nests and they will come after you. There is another darker red wasp that makes nest in the trees about 8" to 10" in diameter in the trees. They are almost black but are pretty unaggresive too. My wife can't stand any wasp so I normally have to shoot the ones down near the house down with a shotgun. I don't have to run from them either.
I suspect if they have been mowed over they will leave on their own. I don't think you will have to do anything about them.