Re: RIP little bees...
Unstunghero, my only indication that there might be or have been some resistance is that the swarm hive and it's splits survived my first year when a purchased hive and it's two splits all succumbed. I don't remember when I finally put in the Apivar strips that year but it was way late, like October late. In most cases that is too late to make any difference and I know my bees were broodless in mid October. Killed a Barnyard Bees queen figuring out that I was not queenless. Last year I switched to OAV, started treating at the end of August and had zero winter losses from mites or mite vectored viruses. Mite drops on most of the hives remained low this year, only one had a huge spike in numbers. Since I calendar treat, I have made no previous efforts to evaluate the hives for resistance, opting to select for vigor instead.
Based on their habits and coloring, I believe that my bees are predominantly Caucasians. But, even the Caucasian queen I hope to get from New River is listed as minimal treatment, not TF as some of their other stock is. So my goal is not to be TF, but to have bees that will hold their own against the mites during the year. A treatment or two while broodless would give them a clean start for the next cycle.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.