You see this word "control" is just out of place when it comes to Bees in my opinion (intuition). How can we humans possibly control something we hardly understand (if at all). The Varroa issue persists thanks to our beekeeping practice (so far) and all the practice is based on the "profit orientated control freak mind" which always puts the Profit before the Wellbeing of the entire Biodiversity including our own specie, the Homo sapiens. Can we trust such a mind which doesnt even care for itsown kind, not to mention other species?! I cant! I will be questioning and observing all this mind comes up with and will be discering all its decissions.
Beekeepers cull drone cells because they are the ones where Varroa reproduce. By removing the drones we remove the Varroa but not all. According to some sources only 50% is removed so the issue persists. The bee colomy decided to have all these drones for a reason and we remove that gene-pool from them! How clever is that?! Strong colomy will survive Varroa if let to their own device and weak colony will perish. As its ment to be! Natural selection. Problem started when we began to try to save all the bee comonies we have (profit orientaded greedy mind). The only way to fix this Varroa/pest/disease issues is to understand this Greedy Mind of ours and by seeing it for what it is let go of it. By letting go of control we will let the bees develope natural resistance and instead of the always stressing greedy control, we will at last, with all our heart, enjoy the miracle of compassionate bee-keeping which is embracing the whole of Universe which makes this Hive of Life :)
As Michael Bush sais "it all works if you let it Bee"
On the photos drone cell wax combs removed to be thrown away. Open cells for inspection reveal Varroa Mites.