This is a recommended way of uniting the 2 halves of a swarm without risking further swarming. I picked this up from Hivemaker (now deceased):I had a colony swarm yesterday (mea culpa - last inspection on 14th!), I watched it happen and collected the swarm into a nuc. Today I have gone through the swarmed colony and cut back to a single QC.
Just wondering, as I knew which hive it was from, what would have happened if I'd reunited the swarm with the original colony, either before or after removing QCs?
-Queen in nuc or collect the swarm
-Take down swarm cells in ‘parent’ colony (I.e. brood and bees left in the original colony)
-Inspect after 7 days and remove emergency cells in the ‘parent’ colony
-Add a frame of open brood with young larva into the parent colony (could take this from the swarm part with the queen)
Take down emergency cells again after 7 days
-Can now unite both halves back together and won’t swarm
-process takes c2 weeks
In summary. you need to switch the colony from swarming mode to emergency queen making mode. 2 rounds of this and it’s safe to unite the 2 halves back together with the original queen and no more swarming. Have done this myself 3x now and a good technique towards the end of the season when mating a new queen is more risky