I just read "Dee Lusby Organic Beekeeper March 15, 2013 by Anita Deeley" and find nothing about losses to Varroa or 350 hives lost to Varroa. I've seen Dee's bees since 2013 and they were still going strong. Apparently you are not even quoting a mistaken source. I find people often take things out of context, do strange math and come up with things that are simply not true but they believe, by the way they have done their convoluted math, that is is true. If Dee's hives have dwindled from 1200 back in the late 1990s down to, let's say the 700 mentioned in the article, that is not losses. That is attrition because her husband died and she never could take care of 1200 hives by herself. You do combines rather than splits and soon you have less hives, rather than more hives. Also as you can't keep up more hives end up queenless that you don't catch and fix and more hives swarm because you're not there to do splits or preventive manipulations. Last I saw Dee she could barely walk. I'm sure she can't keep up with 700 hives anymore so I would expect that number to fall some more. Not because of Varroa. Not because her methods don't work. Because she is human, getting older and not very mobile. People's views of things are usually simplistic. Reality is not.
Let's try an example. If I had 200 hives/nucs (and nucs don't survive as well as hives) going into the 2009 winter (and that's about what I had) and if I left the country (which I did) and did nothing to take care of my bees for the next six winters (which I did not have the time to do being out of the country and then on a book tour) and if I had average losses for Nebraska (as measured by the Bee Informed Partnership, which would be remarkable since nothing was really being done to manage the bees at all including no splits, no swarm control, no feeding etc.) what would be left at the end of those six winters? Let's do the math. Winter losses for Nebraska for 2009/10 were 28.54% average so that would leave 142 hives. The next year average losses in Nebraska were 14.68% so that would leave 121 hives. The next year, 2011/12 average Nebraska losses were 23.37% so that would leave 92 hives. The next year 2012/13 Nebraska losses were 37.85% so that would leave 57 hives. The next year 2013/14 Nebraska losses were 17.89% so that would leave 46 hives. The next year 2014/2015 average Nebraska losses were 17.28% so that would leave 38 hives. Remarkably, with no beekeeper intervention (which is not what I am recommending) I still had about 40 hives left, which is just about the average losses for Nebraska beekeepers who were doing swarm control, splits, feeding, requeening queenless hives, and probably some of them were doing Varroa treatments etc. And yet, despite that reality, there are people who spread rumors that I had "devastating losses" of 160 hives in a year, which, if course, is simply not true. My hives dwindled from 200 to 40 from neglect over a period of six years, some of which I was out of the country and the rest of which I had no time. If one ignores the complexities of reality one can make up whatever rumors one likes, I guess. It still will not make them true.