I may be reading this wrong but it seems to be saying that the hives that are recieving bees are the ones that are affected with vorroa and not the other way around and that placement of hives seems to be less important in drift. That many of the drifting bees came from outside of the test hives.
https://pdfs.semanticscholar.org/dd0c/7126cb66390aea4e221c0276ac3ec7762f1f.pdf
Of course my reading level may not be up to par.
Cheers
gww
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