I live on 59 degrees north and 15 degrees east in Sweden. It can be quite cold in winter and bees can’t usually leave the hive a single time from about November until about middle of March, sometimes late in
Small cells and VSH
There have been numerous tests of varroa reproduction with bees on different cellsizes throughout the years, with the assumption that you then test varroa resistance. As far as I understand that can be true, but you don’t know to what