Quoting from the UK Department for the Environment Food and Rural Affairs booklet 'Managing Varroa' re Oxalic acid Quote Ideally needs broodless conditions, 90% average efficacy possible, sugarless solutions have poor efficacy,DANGER OF SIGNIFICANT COLONY WEAKENING (my emphasis), more scientific trials needed.... End Quote From the above I would not hesitate to suggest that oxalic acid could have some toxicity to bees. (toxicity does not necessarily mean kill) Ruary ----- Original Message ----- > I also wondered Ruary but figured I would get a storm of emails if I even > suggested the term toxic as used was referring to bees. I have seen OA > used > for over a decade in many areas of the U.S.. As Medhat pointed out only > when > the wrong mixture has been used has the OA been toxic to the bees. ****************************************************** * Full guidelines for BEE-L posting are at: * * http://www.honeybeeworld.com/bee-l/guidelines.htm * ******************************************************