Varroa are only new to our area, I would suggest they are already adapted to a level that will allow for sufficient reproduction for the species to survive.  And given the fertile ground that is commercial beekeeping, regardless of how resistant our bees become, the varroa are at a sustainable level of host destruction to maintain more than adequate populations, so I am not sure that there is any selective pressure to a milder varroa mite... Mark 

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