Diagnose Honey Bee Disease

The report is in from the USDA Beltsville bee research lab. Honey Bee Hive - A was apparently over run by the Varroa Destructor. I thought I had this parasite under control but I did not treat the hive with chemicals. I only did some occasional dusitng with powdered sugar. Obviously I was not doing it right or often enough. Especially as fall was turning into winter. I will review my videos...