>What I am thinking is that DWV was astronomical despite the varroa levels
being at or slightly above the threshold of 3-4%

Pete, I can't remember the paper offhand, but a similar phenomenon was
documented in England several years ago--low mites, high DWV.  It could
well be that some lagging colonies these days are suffering from a
particularly virulent variant of DWV.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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