> Today, as Pete points out, applications of some varroacides likely keeps
> tracheal mite pops down.  However, according to research by Dr Eric Mussen,
> amitraz was not effective against T mite.  Amitraz has been the main or
> only miticide in many commercial operations for some time, so I'm not clear
> as to whether it has much to to with T mite.
>

My guess is the reason we do not see it is two fold. First, Varroa is
blamed even if it is Tracheal.

The second is it has not built up to the level which leads to massive
crashes, a classic pest/host relationship.

Bill Truesdell
Bath, Maine

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