Re: something to think about
All hives (at least in areas where mites exist) have mite pressures. The upside of not treating is you are speeding up the selective pressure a bit, the downside of course is the corresponding loss of genetic diversity. There is really no argument among bee researchers (and I would heartily agree) that today's bees tolerate varroa much better than when we were first impacted 20+ years ago. Clearly the North American honeybee is on a treatment free "glide path" in respect to varroa. It is however, difficult to predict just how steep (or shallow) the slope is, certainly it's a far different path than the trachael mite which was a relative "flash in the pan". The point is, though, that progress is being made and it's essentially because all breeding is selective breeding whether you choose to treat or not.
"People will generally accept facts as truth only if the facts agree with what they already believe."- Andy Rooney