With the first swarms of the year already on the loose, I thought it might be time to have a thread dedicated to this topic. Here are my thoughts on it:
I think that after integrated pest management, swarm prevention is the most important aspect of bee management. Bees naturally want to swarm, it's necessary for the survival of the species under natural conditions. Swarm prevention takes a decisive effort by the bee keeper to subvert the bees instinctive tendencies. There are two broad categories of swarm prevention: proactive and reactive. Proactive swarm prevention involves managing a colony in such a way that they will not want to swarm. Reactive swarm prevention involves checking the colony every week during swarm season for swarm cells and doing an artificial swarm when swarm cells are found.
I implement proactive swarm prevention as follows: I re-queen all of my hives every spring. Young queens have very strong pheromones and that goes a long way to prevent swarming. The one year old queens go into Nucs for sale or expansion. I weaken each colony during peak swarm season by pulling Nucs from them. This allows me to checker board the brood nest at the same time. When I pull 4 frames from the hive it's normally 2 of the nicest brood frames and 2 honey/pollen frames. I put two frames of drawn foundation in the middle of the brood nest, brood on either side of those, then two frames with foundation on the outside of the brood nest and then the honey stores on the outside. This gives the queen lots of immediate laying space and gives the wax producing bees something to do. Those 2 center frames of drawn comb often get filled edge to edge with brood and are a thing of beauty.
I normally pull one Nuc shortly after drones start flying at the beginning of May, and then another 3 to 4 weeks later. Our major honey flows are July and August, so the bees have all of June to recover from the heavy splitting. If your major honey flows are earlier then this strategy might not work for best honey production.
This strategy seems to have worked out well, I've had no swarms since I started 4 years ago, but perhaps my bees are not prone to swarming.