" Keep in mind Oxalic acid does not evaporate and the bees did not even
touch the materials "

of course, in the case of "dry" application, but oxalic treatment are
mainly used as evaporated treatment and sugar solution mix. In this cases,
bees really "touch the materials"

Juanse, click on the following link (abstract in english), it`s about
argentinian oxalic approved treatment, OXAVAR
http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802003000200010

Recently, University of Sussex, Lasi Group, conducted an experiment
comparing three aplication methods and reached the following conclusion:
"Application of OA via sublimation, where OA is applied in its pure form by
vapourising the crystals with a special heated tool, was superior to
application as a solution via either spraying or dribbling"
http://www.sussex.ac.uk/lasi/sussexplan/varroamites

P. David Quesada
Honey Bee Lab
Spain

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