I wonder if you tried to treat biological Varo. I use a kind of hive of Professor Ursu, which collects VARO in drone cells, which we later distrugen before it hatched drones.
propolis de vanzare and miere poliflora de vanzare
I think the most important is that this flight did cleaning and started to gather pollen necessary for growth of juveniles. This will ensure proper development of the colony of bees and honey for us later.:)
miere de albine