If you do not use any mite treatment, how long until you can be encouraged that your bees are resistant? I have heard 3 years treatment free. I have requeened all my hives with daughters from my VSH breeder (Glenn Apiaries) and have not treated since the fall of 2010. My uncle who has just mongrel bees has not treated in 3-4 years. He just decided to give it up cold turkey because he did not feel like paying for apistan anymore. He runs 10-20 hives, I run the same numbers. So how long until you have reistant bees?