> Formic Acid is being used extensively in Canada where it is now > legal <snip> > That is why I > like the Nassenhof dispenser developed in Germany and available in > the U.S. from Betterbee. It wicks the formic right in the center of > the brood cluster and will last three weeks. It has been extensively > tested in Germany but needs to be extensively tested in this country <etc.> One test to ponder is the effect on honey production. Some studies have apparently shown slow release methods to have a significant negative effect on honey production compared to quick release ones. Both had similar effetcs on mite levels. FWIW. Regards Allen W. Allen Dick, Beekeeper VE6CFK RR#1, Swalwell, Alberta Canada T0M 1Y0 Internet:[log in to unmask] & [log in to unmask] Honey. Bees, & Art <http://www.internode.net/~allend/>