>Have you overwintered with the OMFs? Or was this just from spring to fall? >Bill Truesdell, Bath, ME Reply: No. The studies were done to see if they reduced mite count during the period between spring and fall treatments, so they could be used as an IPM tool. By the way, we didn't set out to prove anything. We wanted to see. If they really worked I would be the first to promote their use, because I want to get away from chemicals as much as anyone else. In fact, I sold all my bees in 1990, partly because of the prospect of having to use chemicals. I think the non-chemical technique that has the most going for it is the removal of infested drone brood. And if beekeepers are willing to try it, I think they will find it not to be that much extra work -- like Lloyd said. What Dr. Calderone meant when he said it was not practical is -- for commercial beekeepers with many hundreds or thousands of hives. Wintering is another ball of wax. Probably screens don't hurt, but it is hard to see how they would help -- particularly if the hive is standing in snow. Upper entrances are the key to wintering. If moisture gets trapped under the cover, there will be mortality. I don't think what is going on 10 to 20 inches below the cluster makes much difference. PB