>>I was always under the impression that when OA was first tested in 
Switzerland by Imdorf Anton and the original 112 test colonies in 
1994 & 1995 the OA solution used was 30 grams of hydrated OA desolved 
in one litre of water.

An Italian study compared OA in pure water and in 2 different 
concentration sugar water solutions.  The OA sugar water solutions 
resulted in higher varroa kills.  It's either because the sugar water 
solution stuck better to mites/bees or was more eagerly ingested by 
the bees.

Waldemar

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