"Beekeepers have a long-established practice of using smoke to calm their bees before opening the hive. Now U.S. Department of Agriculture scientists have found another potential benefit from smoke: Some plants, when burned, give off natural chemicals that control honey bee mites. Frank A. Eischen, an entomologist with USDA's Agricultural Research Service in Weslaco, Texas, has found that smoke from certain plants either kills varroa mites or causes them to fall off the bees. After 30 seconds, smoke from the grapefruit leaves knocked down 90 to 95 percent of the mites in the cage test. With grapefruit leaves, however, few of the mites are killed. Most simply fall off the bees." http://www.ars.usda.gov/is/ar/archive/aug97/mitesmoke0897.htm This isn't new information, and three years ago someone on this forum mentioned that Ross Conrad discussed it in his book. Has anyone tried it and gotten decent results?