I use divided 5 frame median nucs for mating purposes with two frames on each side. Last summer I lost about half of my mating nucs due to robbing even though I had restricted the entrance so that only one or two bees at a time could pass thru.
Would robber screens help solve the problem? Or, would they tend to prevent the new queen from finding her way back in after the mating flights?
Would robber screens help solve the problem? Or, would they tend to prevent the new queen from finding her way back in after the mating flights?