Bee louse

The bee louse (Braula coeca) is a wingless fly belonging to the family Braulidae within the order Diptera. Despite its common name, it is not a true louse but a specialized ectoparasite that lives on the bodies of adult honey bees. These tiny reddish-brown insects are often found clinging to the thorax or abdomen of the host.

The primary hosts for Braula coeca are honey bees (Apis mellifera). While they can be found on worker bees, they show a distinct preference for queen bees. High levels of infestation on a queen can interfere with her grooming and feeding, which often leads to reduced egg-laying capacity and potentially compromises the survival of the entire colony.

The life cycle of the bee louse is intimately tied to the honey comb. Adult females lay their eggs on the inner side of the wax cappings used to seal honey cells. Upon hatching, the larvae tunnel through the wax, creating intricate pathways. They feed on stored honey and pollen within these tunnels before pupating and emerging as adults to infect new bees.

The damage caused by these parasites is both mechanical and nutritional. By stimulating the bees' antennae to obtain food, the lice disrupt normal foraging behaviors and deplete the bees' energy reserves. Significant infestations result in weak, restless bees that have a reduced ability to store winter supplies, which is a major concern for commercial and hobbyist beekeepers alike.

Integrated Pest Management (IPM) is essential for control. Effective strategies include the removal of old, dark brood combs where larvae are most likely to be present, as well as the periodic use of approved acaricidal treatments. Maintaining strong, healthy colonies and ensuring high standards of apiary hygiene significantly reduce the probability and severity of Braula coeca outbreaks.