From the post it, in this case, appears that cell size had no effect on Varroa tolerance but the bee is the defining factor, since the 1,000 colonies were requeened and that made the difference. One can infer that they were not small cells, but if they were, then they had Varroa and were also collapsing. If they were large cell, they also were collapsing but a new queen added resistance, in spite of the cell size. Cell size may still have an effect, but here it seems that it is the bee. What were what is/are the race/s of bees that the Weaver stock was derived from? It seems that more than one is involved. Bill Truesdell Bath, Maine :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::