>> >One has to wonder why the difference in P-MIB due to screened floors.

> Guessing that humidity is involved.  Varroa appear to be rather dessication sensitive.

Or... the increased ventilation may dilute the odor cues that varroa mites use to find suitable cells to infest. That would be my guess, but then -- I am all about the internal hive odors. 

PLB

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