Looking up the link that Dee gave, http://www.nysaes.cornell.edu/ent/biocontrol/pathogens/fungi.html, I noticed the statement: "Metarhizium anisopliae is registered in the U.S. for control of household cockroaches." Hmmm, perhaps once Metarhizium anisopliae is FDA registered hive roaches may no longer be a nuisance in Metarhizium anisopliae treated hives, at least for a while until they too, roaches, become resistant to the primary treatment. Cheers, Chuck Norton Norton's Nut & Honey Farm Reidsville, NC :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::