Hi you wrote:
hives in which bees disappear is probably tracheal mite. Not visible, but when it reaches certain levels of infestation the bees are just gone.
If you are referring to the time in early spring when a beekeeper goes in and finds not a live bee in the colony and no starving bees in the cells (heads in) nor on the bottom board, it could also mean one other thing!
Natural combining of nearby colonies together be they wild or domesticated. Then the queens combining act like mother daughter combinations and eventually the most able queen (normally younger)rules.
Also might add in some areas it is not uncommon to find more then two queens banding forces together to survive with then multiply queens being found to exist. In in open these are just multiple queen swarms. Found in hive we just consider them mother daughter combinations and often then don't look for more then two queens being satisified having found two.
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