Kill the old queen, and let them raise a queen from the cells they have.
Sharon Labchuk wrote:
> I clipped and marked my queens this year for the first time and did what I
> could to reduce the swarming urge. Nevertheless, one colony swarmed today
> - with the swarm returning to the hive. After scanning the internet for
> some solution to this dilema, I'm now entirely unsure of what to do.
>