Waldemar asked:
> So, if a recipe says to use 75g of OA, and one has only the OA dihydrate,
> then, according to the molecular weight ratio, 105g of the dihydrate
> should be used?
My understanding is that oxalic acid is normally available as the dihydrate
and that formulae given for treating varroa are based on it. I sometimes
use the drip method on colonies returning from the heather moors when is is
to cold for thymol. The formula I use is 35g oxalic acid dihydrate in 1
litre of 1:1 (sugar:water by weight) sugar syrup and 5ml is applied per seam
of bees.
There is good information here:
http://www.apis.admin.ch/en/krankheiten/oxal.php
Peter Edwards
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