> What if we try to breed not only betters bees but also less aggressive
varroa?

This strategy would only work if all beekeepers in a continent all agreed
not to restock colonies from any other than mite survivors.  Otherwise,
natural selection will always favor more aggressive varroa.  This sort of
beekeeper cooperation will never happen in the U.S. in my lifetime : )
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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