Re: Treatment free "genetics" question
with only one or a few hives, it would make sense to let the circumstances determine what needs to be done. if your bees are doing great and don't need any help don't treat them, and let them propagate the good genetics. if they get mite infested beyond survival, knock the mites down and requeen. the hard part is no one has a good answer to the question 'how many mites are too many', although 5% infestation in the summer seems to be the working number. if you have to take action, do so before the fall brood up, so that you will have queens available and the wintering bees will be from the new queen.
journaling the growth of a treatment free apiary started in 2010. 20+/- hives