Here is a new report of a research done including the use of "small" and "big" cells.
https://brage.bibsys.no/xmlui/handle/11250/2565356I used small cell foundation myself for 2 years. Started to introduce empty frames in 2016. There is no difference in cell size between the two, it?s mostly 4.8 to 5.2 in worker broodnest area.
The wax foundations are often changed to various cell size by the bees but some bees colonies built perfect small cell broodnests on the foundations. Depends on the seasonal changes. Just like on natural comb. I cut 15% drone corners on every foundation.
Bees are AMM, carniolans and elgon mutts.
Same with all races.
The average natural cell size in my climate and with my swedish stock ( now mixed) is 5.1.
I have 33mm space between frames. I like the density of bee numbers and broodframes in my square dadant box because brood stays in one box, even without a queen excluder.
Much easier to work with one broodbox, In spring, when my mite infested treatment free bees come out of winter in small cluster they still build up to be strong with first main flow, wild cherries.
That because of the density and warmth.
What they say in the article about central europe is not true. Sure, more reinfestations. But when I was on the tf conference in Austria in spring 2018 I realized that we have many tf beekeepers who work hidden because of our laws. And we have 240 feral colonies observed which were found, which are never treated.
Today my opinion is that having ferals around, wild living honeybee colonies with survivor genetics are the clue. They spread the survivor genes. this can be done by beekeepers too, flooding the area with survivor colonies`s drones and breeding only from survivors or colonies which hold mites at bay, which means monitoring.