Tom said: Get off the mast and save those bee if you can! "If you can" needs to bee looked at. Buzz gives good advice as do all which have posted so far. The reality of Yoon's situation: Test each hive. If over threshold save your time and money as they are going to perish. Been there done that! If the hive is under threshold you can treat but if close to threshold only a 98% control like "Checkmite" will clean up the varroa. *and* The hive will be short on young perfect bees to winter on (very important in cold weather areas) Either move all the hives over threshold to a remote area to die to keep down reinfestation or put those hives out of their misery. I would call your Oklahoma bee inspector for help! Sorry to hear of your problems Yoon and wish you the best luck with whatever course of action you decide to take! Bob :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::