2 of my original queens were VSH, one a Flyman queen and one from Beeweavers. The Flyman queen was superceded last spring, and presently that hive is being run by one of her granddaughters. (I do not mark my queens). My 3rd hive is a swarm that seems both gentle and productive but I have no idea if they are hygenic. So I put sticky boards in with oil on them a couple of weeks ago and I have dusted with powdered sugar a couple of times, really not seeing more than 20 mites in a drop time of a week. so how do I know it is time to treat? LOTS of drone brood, relative to worker brood in the flyman granddaughter's hive. I removed some and started popping open capped brood, at least one mite per larvae. My Varrocleaner came last week, still need to pick up oxalic acid locally. I removed all the drone brood I could find from that hive. The swarm hive had a couple of frames of worker brood total, not much uncapped, I don't think I saw any drone brood or if I did just a few cells. The Beeweaver hive has a deep and 2 mediums, it was getting late. Since I know I have to buy the acid anyway, I figure I will treat the other 2 while I go through the BW hive and see what the situation looks like. I have not seen any DWV or K wing in the apiary this year.