Lost 4 of my 5 hives this winter, and diagnosis is nosema. My questions are, 1. is it necessary to try to clean up/disinfect the frames and boxes from the affected hives? I live in Ohio, and supposedly cold kills off nosema spores? 2. should I treat the survivor and new packages with Fumigilin? 3. which of the 'snake oils', feeding supplements, etc. etc. out on the market might be effective at keeping my bees healthy when I replace them? Thanks, everybody.