Beekeepers interested in the use/not use of oxalic acid might have a look at the work of Danish scientists on the site below belonging to a branch of the Danish Department of Agriculture. The site is in danish, but the article is in english :-) You have to subscribe to look at all the pages, but the article is freely available by following this procedure: 1 - go to www.planteinfo.dk 2 - click the grey button with PL@NTEINFO DIREKTE written on it 3 - click the link SYSTEMER in the left frame 4 - click the link BIAVL in the left frame (biavl is beekeeping) 5 - click the link OXALSYRE in the right frame This will lead You to an article - about the subject. I think You will find it interesting. Kind regards, Lars Hansen Denmark