Interesting question on tracheal mite Pete! When it first arrived, the pressure by natural selection was very strong--we lost about 70% of colonies in Calif. However, it was easy to select for resistance. But that was before varroa arrived, and our applications of miticides. Such applications could remove the previous selective pressure against tracheal mite. -- Randy Oliver Grass Valley, CA www.ScientificBeekeeping.com *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm