>
> I have to deal with this question occasionally so I can use some help. Do
> we know for certain that evolutionary change is responsible for the
> diminished reports of tracheal mite infestation or is it possible that the
> persistent use of acaricides in our efforts to irradicate varroa are
> providing a beneficial side effect?
>
>
According to the OBA website, the Ontario Resistant Honey Bee Selection
Program tests and maintains the tracheal mite resistance trait by
introducing tagged bees into colonies infested with tracheal mites and then
checking the workers after seven days.

http://www.ontariobee.com/ORHBS

Adam
Barrie,ON

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