I've been wondering:  Apistan works on varroa when they are outside the
cell -- the so called phoretic state.  Fluvalinate is hard on varroa, but
has relatively little effect on the bees.
 
Here's the question:  Tracheal mites have to spend time outside the bee in
order to transfer to other (younger) bees. In such a state, are they
susceptible to some extent to Apistan (R), or are they -- like the
honeybee -- somewhat fluvalinate tolerant?
 
Allen