Successful overwintering
Winter is undoubtedly the most demanding period for bees. However, nature has provided so-called “winter bees” with characteristics that enable them to withstand the rigours of the cold season. Winter bees have larger fat reserves than summer bees, they possess a more developed hair covering that provides natural insulation, and the contraction of the thoracic muscles generates a significantly greater release of heat than in summer bees. Their constitution, together with their behaviour, allows them to live longer and to cope with the harsh conditions of winter.
Successful overwintering of honey bee colonies – key principles and practices
Winter is the most demanding period in the life of a honey bee colony. Winter bees are physiologically adapted with higher fat reserves, dense hair and strong heat production, but colony survival largely depends on proper preparation by the beekeeper.
At the core of overwintering is the winter cluster. Large colonies maintain temperature more efficiently and consume less energy per bee. Honey is essential both as food and as fuel for heat production. It must be available in sufficient quantity and of good quality, as some honeys (such as honeydew or heather honey) are difficult to digest and may cause dysentery.
Successful overwintering requires several key conditions: a strong population of winter bees, adequate and well-positioned food reserves, a healthy and productive queen, low varroa infestation, a hive volume adapted to colony size, good insulation above the cluster, and a calm, dry environment without drafts.
After the last honey harvest (usually late July or early August), food reserves must be assessed, the brood nest reorganized, and colonies fed early if necessary so that summer bees perform the storage work. Varroa control is critical and should be carried out as early as possible, as heavily infested colonies rarely survive winter.
Weak colonies should be united or overwintered in reduced hive volumes using insulated partitions. Drone-laying colonies must not be overwintered.
Hive placement and surroundings are also crucial: protection from moisture, controlled ventilation, reduced entrances, sunny and wind-sheltered locations, and regular winter monitoring all contribute to success.
In conclusion, successful overwintering is the result of early planning, sound health management and proper adaptation of hive equipment and environment. Winter success is largely determined in late summer.
See also:
- Practical Guide: 4.3 Overwintering
- Overwintering in the Honey Bee: A Unique Phase of Its Biological Cycle
- Preserving the Life Capital of Bees
- Winter Feeding at the End of Winter: What to Make of It?
- The Sense and Nonsense of Hive Thermal Insulation
- The Recommended Varroa Treatment Regimen Increases Colony Survival