I've lost several mating nucs to robbing this year.  So far, I have found that setting up a hive body into two nucs is working the best for me.  Still it is hit an miss.  I am working in all medium boxes, anything less than four frames full of bees can't seem to defend itself.  Has any one come up with a robber screen device that will allow the mated queen to enter?

Jim Hock
Wethersfield, CT

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