Mark, is it possible that the one hive swarmed just before you noticed a large decline in bee population? Producing comb honey will make swarming more likely. According to Roger Morse, 20% of hives might swarm late in the summer. Something else to consider. Bob Cessac K-B Ranch Natural Beef 2362 St. Rt. O Higbee, MO. 65257 816-248-5201 [log in to unmask]