Re: Treatment free hives plan of action?
Three years treatment free is a good start but could still be susceptible to mites. The best way to handle this is to pull a bee sample this fall and do a mite count. If the count exceeds 1 per 100 bees, they are probably too susceptible.
I would investigate other sources of genetics that are treatment free and have a 7 or more year history. Bringing in outside stock with verified tolerance will permit you to diversify the genetics which will avoid problems when bees are too closely line bred.
NW Alabama, 46 years, 24 colonies and growing, sideliner, treatment free since 2005, 14 frame square Dadant broodnest