> Examination of floor debris can give useful clues as to what's
happening overhead including evidence of bees damaging
mites or aborting afflicted pupae.
So I have been finding lately. Instead of lifting a lid and pulling
frames, one can learn to interpret what is landing on the drop
board. There is a learning curve, and like any method of
observing bees, there is a learning curve and patience is required.
This method of observation is almost entirely non-invasive and very
instructive.
The hive bottom can be left either closed or open, simply by inserting
or not inserting a board.
I agree with Peter, though that counting on open bottoms for mite
control could lead to disappointment.
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