One thing I've found works for yellow jacket nests around me is the foaming spray. Its relatively non-toxic, blocks them from leaving the nest and in my case attracts animals that love to eat yellow jackets. I had 3 nests last year, just after dark i sprayed them and by the next morning the nests were totally dug out, all the bees were gone and there were nest pieces all over the place. My camera had pictures of a racoon digging it up. Apparently Raccoons and skunks love to eat yellow jackets and at least around me they seem to have realized the link between bug spray and a nest to eat, so it attracts them. Later in the season I just sprayed it near a nest a little bit and the nest was dug up again the next day. Works great! We have carpenter bees as well and they're putting holes in my buildings, between them, termites and woodpeckers its amazing anything wooden survives!