Biotechnical methods, which do not require the use of chemical agents, can also help reduce the varroa mite populations in hives before the harvest. These methods are an integral part of the recommended alternative control concept. We distinguish between the cutting out of the drone brood, which is particularly attractive to the parasite, and the formation of splits, which interrupts parasite reproduction owing to the temporary suspension of egg-laying by the queen.
The removal of capped drone brood: an effective means of reducing the infestation of Varroa in honey bee colonies (PDF, 78 kB, 20.01.2017)
J.D. Charrière, A. Imdorf, B. Bachofen, A. Tschan (1998)
What Part of the Varroa Population is removed by creating a Nucleus ? (PDF, 37 kB, 20.01.2017)
J.D. Charrière, C. Maquelin, A. Imdorf, B. Bachofen (1998)