In daylight use 2 by 4 or other long pole to EXACTLY mark the
entrance...

Come back at NIGHT, use NO lights at all! They will instantly go after
lights

Pour gasoline into bucket, approach quietly dump gasoline quickly down
hole. This kills them instantly!

Now light the hole if you want it will burn off the gasoline.

If you REA:LLY concerned a few days later dig up the nest and
surrounding soil dump in non garden area.

or leave that area for flowers only for a few years

avoid the hole for a few days straglers who didnt make it home the
night of the disaster will fly around a bit then go away