Time-Lapse Video Captures the Development of Baby Honeybees
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Obviously such treatments are only useful for commercial beekeepers - not the wild / feral colonies. The problem there is that it means commercial beekeepers have to keep using the same chemicals forever (or until the mites develop a resistance), as they'll continue to get re-infestations coming into their area.
There's some suggestion that the smaller (or 'natural') cell sizing may reduce their impact, as there's less room for them as the bee matures. Cell sizing is, typically, in commercial hives, dictated by the foundation sheets of wax put into frames, and sized ever so slightly larger than what's found in wild or feral hives, on the principle that you get more honey from bees that are slightly larger. I would note that we're talking a few millimetres difference here.
On the other hand, massive reductions to the volumes of wild colonies suggest natural - what the bees would make themselves - sized cells aren't a simple answer to this pest.
I'm in Australia, and hope to catch a few swarms this year - in this part of the world the first swarms are consistently seen in the first two weeks of September. We don't have Varroa mites here, yet, but it won't be long. They're in our neighbours to the north (Indonesia & Papua New Guina) and east (New Zealand). The life cycle of bees unfortunately lends itself to wide and rapid propagation of pests and diseases.
I wish there had been a single continuos shot that showed the whole development process, with and indication of how fast time is progressing.