> I am aware of the effectiveness of dribbling oxalic acid or vaporizing it to
> control mites during the broodless period but I have been unable to find any
> answers in the way that it kills mites. \

Hi Claude,
The mites are sensitive to acidity.  It may affect them by contact,
but it appears to me that they are also affected by feeding on the
temporarily acidified bee haemolymph.  The sugar acts as a humectant
that allows the acid to better penetrate chitin.  Glycerine will also
work.

Randy Oliver

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