Tom: Why don't you contact Bob Noel, he has a lot of experience on using essential oils to treat both mites. Moreover, he is quite willing to help fellow beekeepers. His e-mail address is: [log in to unmask] You should also visit: http://www.wvu.edu/~agexten/varroa/ Martin Braunstein Malka Cabania Apicola e-mail: [log in to unmask]