KILL THE QUEEN! game over.
I dealt with the same problem, but they were in the wall of the house. I contacted a helpful guy that ran an exterminator business and he sold me a 4 oz (by wt) container of a product called Drione. It's like talcum powder. Lay a little at their entrance hole so they have to walk thru it. The inconsiderate little buzzers never wipe their feet. It is a timed release kill, so it takes a few minutes to kick their stinger. They head for the Queen to service her majesty. The rest is history.
