>>oxalic acid and it reminds me of Apistan use some time back. I'm wondering if everyone is just creating a more super mite... As far as one knows, the use of organic acids does not select for resistant mites. Time will show if this is the case. >>Those people using small cell bees don't worry about any chemicals at all. I've been using one-piece plastic frames from day 1. Are there plastic frames with 4.9 mm cells available? Waldemar Long Island, NY -- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---