Wish i knew how to post a pic. Few weeks ago it was warm and the bees were everywhere. Then it got cold again. Now its warm again and not a bee in sight. Opened the hive to see if i could find a cause other than it got real cold real fast (again) .. There was still a LOT of capped honey to be found. No living bees. On top of the frames was a white powder looking substance. Like someone sprinkled parmasan cheese on them. Hive was treated for mites last fall. There was a dead cluster in the super with all the honey. Any idea what the problem was? My main concern is the parmasan cheese looking stuff. I thought maybe wax bits from them opening up honey throughout the winter, but everything i read is about bees being clean and them letting bits of wax falls seems a bit unusual. Any thoughts would be appreciated. First winter with bees. Bit demoralizing, but we are going to keep keeping bees until we get it right