2nd year chemical free, no shake, no smoke, no upper ventilation, bee gym, slatted rack, screened bottom backyard beekeeper. Lost 2016 hive over winter because I naively didn’t manage varroa mites. 2017 hive received fall wintergreen grease patties in October and varroa mites are significantly dropping (counted 600 in a week). When not using essential oils, I dust with Super DFM Honey Bee probiotics. Recently stumbled onto research using psudeoscorpions as a biological management for varroa mites.