>>>>When I checked a hive once after a treatment, I saw freshly deposited OA syrup in cells. There had been no flying weather since the treatment. >>How did you know it was OA syrup? I could not be certain 100% (I did not taste-test it ;-). It was on a frame, where there had been no stores at the time of the treatment, outside of the cluster. There had been no flying weather and I did not feed. It had a whitish-watery appearance. It looked different than anything I've ever seen. The bees seemed to stay away from it. It disappeared only a few weeks later. >>OA in nucs is a great way to start relatively mite free colonies. It's also good for treating unknown swarms. Going forward I plan to keep captured bees from any varroa-infested house/tree colonies - this year there was only 1 in 10 or so - separate from their brood and treating with OA. I'll treat the brood with OA after its emergence. Waldemar Long Island, NY -- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---