The guys in my local club tell when and what to use, they also say if you want to have bees you will treat. So far I haven't treated for mites,ever. I do treat for SHB's. It is up to you whether you do or don't treat. You should get a good response, weigh them and decide for your self. Beek that treat and those that don't both loose bees. Those that do treat will say they don't loose near as many. Good luck
Joe