From the video: Practical Beekeeping Part 10
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The colonies are now broodless, queens have stopped laying eggs, and temperatures are around 0°C. The bees have formed a cluster — this is the best time for the final treatment with oxalic acid, which removes the remaining varroa on the bees.
A patty is placed on the inner cover, but is not activated until the first spring cleansing flight. A final inspection of all hive boxes is carried out — checking that inner covers and roofs are fitting properly, that there are no cracks, and that everything is sealed for winter.
During winter, hives are periodically checked and cleared of snow. This is a period for preparing equipment — fixing supers, replacing deformed frames, and planning for the next spring-summer season. Winter is also a good time for educational lectures and exchanging experience with other beekeepers.