Dear bee list,
 
I have been but a lowly net-lurker, and don't even raise bees, but I
thought I might suggest a couple chemicals for mites.
 
In our fruit-fly laboratory we sometimes get mite infestations. I have seen
at least two species, and others may also attack the flies. Doubtless these
are not verroa, but they are mites anyway.
 
1.  Lindane-treated paper will kill mites that walk accross it. Lindane is
123456-hexachlorocyclohexane, or C6H6Cl6.
 
2.  benzyl-benzoate (one part in 5 parts isopropanol) can be used to treat
work surfaces. formula C14H12O2.
 
Maybe someone would be interested in this information.