do your top bar hives have screened bottom boards?
Our top bar hives do not have screened bottom boards. I’ve experimented with them in the past on my 20+ hives and I’ve seen no difference in success or varroa mites. However, we’ve started offering them for Warre hives due to the number of requests we’ve received. We plan to offer a SBB version for our horizontal top bar hives by spring.