Hi, Wajih.  The easiest way to control swarming while having the
least disruption otherwise is to install a queen excluder under the
bottom box (above the bottom board).  Swarms then will self-retrieve
in less than two hours.  You have to check for queen cells every 10
days while the QE is in place.  I presume the "swarm fever" which
continues will detract from their concentration on new nectar but all
the bees will stay in the hive.  Dan


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