Hi Karen Kimball
The shrews (I'm convinced) on most hives can reach a top entrance. In
my hives I have a round 3/8" top entrance in the winter. if you have a
bigger hole put a plug in it with a 3/8" hole drilled.
As soon as bees can forage gainfully you can remove the restrictions.
I have not encountered shrew problems in the normal bee foraging
part of the year.I start the restrictions at the same time as I close the
hives for winter.
Hope this helps
Viktor still in Hawkessbury, On.
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