My friend was stung a couple of days ago by yellow jackets, for the 6th time this summer, so I spent yesterday trying to locate the nest. I think I found at least one of their hide outs, but sure there must be more seeing as she does have a LOT of junk in her backyard. When it gets cool, we are going to try cleaning her backyard. I just hope that her son is healthy enough by then to help. Right now he is dealing with cancer. With each sting, she seems to have a worse reaction and I'm afraid that she will have a more severe reaction eventually. I have encouraged her to talk with her doctor about having an epi-pen available if it does happen.
Hope you get your visitors taken care of real soon. Good luck.