Brood Separation
Lexikon
Brood interruption refers in beekeeping to a group of biotechnical measures in which the queen's egg laying is separated in time or space from the brood already present in order to interrupt the reproductive cycle of the Varroa mite.
Brood interruption refers in beekeeping to a group of biotechnical measures in which the queen's egg laying is separated in time or space from the brood already present in order to interrupt the reproductive cycle of the Varroa mite. The basic idea is the same in all variants: because the mite reproduces exclusively in capped brood, the artificially created gap between old and new brood produces a time window in which as many mites as possible are on the adult bees and can be treated effectively there with organic acids.
In practice, brood interruption is usually carried out by dividing the colony, for example by separating off a part with the queen and open brood, while the remaining part without a queen is initially left to itself until all the existing brood has emerged. Since capped worker brood stays in the cell for about twelve days and drone brood a few days longer, this waiting period must be long enough before this part is actually completely broodless and can be treated. The same basic principle also underlies complete brood removal, in which all brood combs of a colony are removed and assembled into combined brood splits, so that the original colony quickly becomes broodless.
For beekeepers, brood interruption is of interest above all when they want to make splits without losing a whole season and at the same time carry out an effective Varroa treatment, because both goals can be combined in a single operation. The disadvantage is the high amount of time and checking required, which is why in practice the method is better suited to committed hobby beekeepers than to large operations that cannot treat all colonies at the same time.
A common mistake is to misjudge the broodless point and treat too early, while capped brood, and thus protected mites, are still present in the colony. Only a careful check of the brood combs ensures that the treatment actually hits a colony that is broodless and therefore maximally susceptible.