From the video: Practical Beekeeping Part 9
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At the end of the main honey flow, the queen gradually reduces the number of eggs laid and the colony enters the fourth period of growth and development. Eggs in this period are larger, with more protein, abundantly fed at the larval stage. From them emerge long-lived, higher-quality winter bees.
Feeders are placed on all colonies and swarms to replenish winter stores:
Winter feed replenishment is completed in 10 days. Syrup is prepared at a ratio of 1.5 : 1 in favor of sugar (late July, early August).
At the beginning of August, one formic acid pad is placed on the top bars over the mesh. The acid is pre-cooled in the freezer to −20°C. On the fourth day the pads are removed and thyme is placed — which contains thymol and gives good results in varroa drop. On the market there is also Apigard gel based on thymol with the same effect.
Thyme is kept until the detailed pre-winter inspection, when equalization of bee colonies is performed — combining queenless colonies. This procedure also provides an additional benefit: more propolis on the mesh screens.