Comb Hygiene
Lexikon
Comb hygiene refers to the regular renewal of the combs in a bee colony, above all in the brood chamber.
Comb hygiene refers to the regular renewal of the combs in a bee colony, above all in the brood chamber. It is considered one of the most important preventive measures against disease, because over time residues and germs accumulate in old combs, which come back into contact with the brood or the food every time a cell is reoccupied.
The reason lies in the structure of the comb itself: every emerging bee leaves behind a thin molting skin in its cell. The workers clean the cells thoroughly, but a residue often remains. Over many brood cycles, the combs darken as a result, the cell walls become thicker and the usable space in the cell smaller. These organic residues also provide a breeding ground for pathogens and attract wax moths, which specifically feed on the molting residues.
For day-to-day work at the colony this means: combs in the brood chamber should be specifically culled from the cycle after a few years, with periods of about two to three years being customary, though some sources advise replacement as early as the second year. In practice this is usually done through what is called migrating the combs, where the oldest frames are hung at the edge and removed there after the harvest or after emergence.
A common mistake is thoughtlessly moving brood combs between colonies, for example to support a weak colony. In doing so, pathogens can be transferred from one colony to another without the beekeeper noticing. Comb hygiene is also sometimes wrongly understood as merely a matter of appearance, even though it is a genuine preventive measure against foulbrood, nosema and other pathogens that can persist in the comb structure.