We want to remain as organic as possible ... but realize that some form of treatment(s) may be needed at times. The more one reads the more questionable some of these treatments become. I'm glad to hear you have never noticed any adverse affects on your bees. These are second year hives, that wintered well their first year and virtually had no mites going into the winter. This season has been alittle different, pretty sure two hives swarmed, was given some poor advice on one occassion, but after my latest inspection, those hives seem to have corrected themselves. We have been using the green Drone frames all summer, but its abit of a pain with our double chambers ... despite this, one hive has a high count, the others are marginal. I would prefer to only treat the one hive, but the instructions are telling me to treat all the hives to avoid robbing?