There are rumours that fogging with oxalic acid vapour has an effect on tracheal mites, but I have not seen anything definitive. Inasmuch as, according to some sources, one of the products of heating OA is formic acid, that seems plausible. Does anyone have any references on the question? TIA Allen Dick, RR#1 Swalwell, Alberta, Canada T0M 1Y0 51 33'39.64"N 113 18'52.45"W http://www.honeybeeworld.com/diary/ *********************************************** 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