Found this on an organic gardening website:
"Tracheal and varroa mites have caused great destruction of honeybee colonies since the 1980s, but painting the hives a dark brown color helps. As the temperature of the hive increases, the bees fan more and their bodies heat up, killing the mites. Tracheal mites are microscopic and responsible for about 10 percent of the mite destruction to honeybees. Varroa mites are much larger and more destructive, causing about 90 percent of the mite damage. Planting lots of flowering plants, especially those rich in essential oils, such as mints or other fragrant herbs, helps to eliminate the mite problem."
Now how about that?