Peter Borst <[log in to unmask]> said " copper gluconate was discussed at length in previous posts." Well if you guys consider that discussion lengthy I wonder what you would call the discussions on open mesh floors that has been had time and time again and still rears it's head. As a beehaver with far fewer years experience than your esteemed selves, I came across the report at http://www.beekeeping.com/articles/us/cupric_salts.pdf and after examining it thought that the research looked thorough and the benefits worth investigating. Following on from my second posting I received two replies in favour of it's usage and none to the contrary. Surely some ideas need to be looked at again in light of peoples experience since they were first mooted, otherwise we would all still believe that the earth is flat and was created in six days, or more recently that if you travel at speeds greater than 14mph you will be unable to breath!