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
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