For Hervé & all > I am used to use the on-line varroa calculator from > the National Bee Unit in GB. The National Bee Unit's varroa model is alive and well... http://www.csl.gov.uk/prodserv/cons/bee/varroamodel/ Regards & 73s... Dave Cushman, G8MZY Beekeeping & Bee Breeding Website http://website.lineone.net/~dave.cushman :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::