I would wait until they stop going in for the night and spray with the 27 ft bees spray..................then plug the holes, they will die off in the ground. If you are afraid to do this have someone else do this who is not allergic to wasp, hornet or ground bees. They have a big nest down there. I did a drive by spray on the lawn mower.............I knew where they came in & out and I had the 27 or 25 ft can ready, shake it good and spray and drive.................came back and did it again...................one more time.............and next morning all dead on the ground and I put small stones in the hole and pressed it down good with my boot or use could use a stick. all gone..............be very careful.................Walmart has that spray..............made by Raid.......................