How do you get rid of underground bees with many openings in ground?

Yellow Jackets are actually in the vespid family, not apoidea, so they are more closely related to wasps than bees. They usually nest in mole tunnels, but I am not sure if they move into abandoned mole tunnels, drive off the mole, or sting the mole to death. In any case spray pesticide specifically for wasps in the mouth of the tunnel and plug it with a rock or chunk of dirt. Most mole tunnels have more than one entrance so keep an eye out for yellow jackets coming and going from the other entrance. They are inactive after dark so that would be the best time to spray and plug. My first experience with Yellow Jackets was having about 50 or so sting me while I ran for the house, so I would rank them as a more serious threat than "killer bees" since they exhibit the same swarming behavior, are more prevalent, and the venom is stronger. My last run in with about 20 nearly put me in the hospital in anaphylactic shock.