Originally Posted by
nemphlar
Thanks for comments, as usual not a single point of failure in this hive, there were 8 completely empty frames around this cluster despite being fed late syrup last year, they didn't process enough late on and stopped taking it down, poor queen with probably old bees around OA treatment when the fondant was added and dwindled later. I understand that in a really cold winter 10 mm is probably too far, but a reasonable sized cluster in the mild winters we've had recently ought to manage. The sugar bag does seem to either maintain or draw cluster moisture more effectively than the fondant
C4u does the removal of the cover leave a rather large air space above the cluster
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