At http://www.ars.usda.gov/News/docs.htm?docid=1261 I read about a new
test for Varrora "resistance to the pesticides coumaphos and
fluvalinate."  It sounds like a modified sugar roll.

"The ARS scientists' bioassay is intentionally low-tech. Its main parts
include glass canning jars in which to contain honeybees, mesh lids
through which mites on the bees can fall out and be counted, and index
cards that hold strips of either coumaphous or fluvalinate."

I was surprised that there hadn't been any discussion of this here on
Bee-L.  Has anyone used this method?  Seems like a good idea to find
out if treatments are going to work before attempting them.

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