That is a really great video. Watching it makes it easy (at least for me) to see why using small cell foundation or letting bees build natural size cells works so well to combat varroa. Less space between the larva and cell wall for the mite to enter the cell, less room for mites to successfully mate, more likely that the mite(s) will become trapped between the cacoon and the cell wall and more likely that the bee will emerge from the cell before the mite(s) is fully matured.
The narrator mentioned having a resistant strain of bees that almost always left the mite trapped between the cacoon and cell wall, but didn't say exactly why. I would be willing to bet that it was because that particular strain was building smaller cells than the others.
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