I have asked this question of the list in the past and did not receive an answer, perhaps because there isn't one.

First, are these premises accepted?:  that part of the bee's strategy is to be generalist vs. specialist, that this is accomplished in part via outbreeding and polyandry,  and that overall vigor is related to the queen mating with at least a minimum number of drones... 

If accepted, then is it possible that increased hybridization and the resulting genetic diversity from it is contributing to the observation of feral populations who appear to be developing natural resistance?  And...

Is there a metric by which hybridization can be compared?

It appears that one of the common denominators among those keeping bees successfully off treatments is that they are working with 'local mutts'.   

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