Some made a nest in our gravel driveway a few years ago and were eating from the fig tree in our front yard. I borrowed a shop vac, put soapy water in it and then laid the nozzle next to the hole for an entire day. After I stopped seeing any I got boiling soapy water and poured it down the hole several times and what was left of the nest (and queen) came out. So many dead Yellowjackets!