I use them only on colonies that are producing comb honey. I do not want brood in the supers so I use the excluders on these colonies. They are not much of a hindrance to honey storage in the supers if you wait until there is something in the supers other than foundation. For example, if you leave the excluder off until the bees have stored some honey or brood in a super, you can then add the excluder and the bees will continue to work in the supers. If brood is already present when you add the excluder, they will emerge and the bees will then fill those cells with honey. Of course, you have to make sure the queen is below the super.
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