In response to "> Does anyone know of a published research paper looking at optimum re-treatment intervals for Oxalic vaporization?" I should add to my previous response that it was not simply a reflexive answer from the hip. I did search for research on oxalic acid vapor, and found next to nought. I think the technique has been pioneered and championed by beekeepers, which is fine by me, but the finer points haven't been worked out. PLB *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html