Here's a little trick my father taught me when I was a kid. We had one of those ground hornet nest under a sidewalk in front of the house. My dad got an old empty beer bottle and filled it half full of water and placed it next to the hole. Now from what I understand and I'm probably saying it wrong the bees know where the hole is by scent (fearmones?) and when they get near the hole they locate the hole when they hover over it. They feel a difference from where there is solid ground and where there is a hole. So the bees crawl into the bottle instead of the hole. Fun to watch