>>...the theory sounds great for distributing OA in the hive; the practice is what scares me! Accidental inhaling of OA concerned me, too, as did the need to purchase or build vaporizing equipment. Then I read studies that determined the varroa kill was just as good with the trickle method. Trickling is quick and easy. The equipment is a graduated syringe. One needs access to a gram scale to get an accurate mix although they've seen in Finland that doubling the prescribed OA concentrations does not seem to affect the bees or the queen. Waldemar -- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---