I have lost 10 out of 25 so far, yes I am treatment free before anyone asks that question. Last year I lost 5 out of 18, I have no idea what has happened except I have found a few with late season queen loss and by the time that was discovered it was way to late. I notice lots of mite feces in the cells and it appears the caps had been chewed open in an attempt to remove them. We have no reports of EFB or AFB in our area but I am really starting to get concerned. I would appreciate any input positive or negative if you wish to offer it.
Good luck to everyone