Cellsize of the worker brood is a hot topic for many. Some don’t bother, others seem to be fighting downsizing of the bees to a more natural smaller cell size in the brood area. And there are those that say you have to do it to be able to get bees that can fight not only varroa, but also other pests and parasites much better. There are tests being done to try to solve the question if small cell size is beneficial to the honeybees defense system, with differing results. I havn’t come across any analysis that tries to explain the differing results, so I have made efforts to do one myself. If you are interested you can click on the link to a pdf-file:
Analysis of small cell test designs
Analysis of small cell test designs