One of my hives is just plain mean and I've lost my patience as I'm tired of getting bombed while in my backyard 75 feet from the hive. My problem is that I'm not sure which one of my 4 hives is the culprit, and their foul mood is intermittent so it's hard to figure out where the angry sentinels are coming from. Sometimes I can walk right up to the hive without any issue, others (like today, granted a cool and windy day) I can't get within 20 feet without 3-6 bees coming after me. How do I figure out which hive is the problem, and then what do I do?
Details: of the four hives, I know it can only be one of three as the fourth is a newly caught swarm. One of the three is a pretty weak hive that I'm planning to requeen as the current queen just isn't doing her job. One of the final two is a monster of a hive - booming with bees and already has three full honey supers. I suspect it may be this one as the queen is from a split I'd made last year, perhaps the new queen mated with a mean drone.
I did full inspections of the hives yesterday and none of them were particularly mean - just ordinary buzzing around and irritation about being disturbed. Certainly no bees boiling out to attack me or anything that made me feel uncomfortable.
So my first question is how to figure out which one is the mean one?
Second question is what to do then? I know I could get new queens and requeen, but could I just find and kill the existing queens and let them requeen themselves? My worry about this is that if indeed the current queen mated with a mean drone then there's a decent chance that the new queen would have this DNA and I'd have the same problem.