> I find it significant that the authors were able to quantify this trait of ‘acceptance of drifters’.  The implications for colony resistance to varroa are obvious.

They did not characterize acceptance of drifters as a trait, but as a symptom of varroa infestation. The bees are sick and they let down their defense. 

Anyway, identifying a particular trait does not imply it's something that can easily be bred for or against.

PLB

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