Almost afraid to ask this because it either the stupidest or most brilliant idea ever. Build a box similar to a pollen trap that fits in front of the entrance and makes the bees go through a short 'maze', so it takes them a few seconds to enter the hive. Along the ‘maze’ have a series of UV lights (solar cell driven). UV-C penetrates the outer membrane of bacteria, yeasts, molds and viruses and virtually kills them. I’m not sure what the effect on mites (or the bees)would be but you would be essentially sterilizing everyone before they entered so they didn’t drag in bad spores etc. with them. Would this work?

Ok, did I make a fool of myself or give someone a multimillion dollar idea?