Commercial beekeepers and queen breeders swear by banana peels on the tops of the frames. I've heard of the ingredient that is supposed to be attacking the fungus, but I forget what it is. For myself, I just switch queen breeders. A good queen seems to keep it under control so much it is non-existent or barely visible. Lloyd -- Lloyd Spear Owner Ross Rounds, Inc. Manufacture of equipment for round comb honey sections, Sundance Pollen Traps, and producer of Sundance custom labels. Contact your dealer or www.RossRounds.com -- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---