>   with very bad years followed by good
>and then another hit about four or five years later. And tracheal mites have
>not left the scene. Some of the symptoms noted here recently are classic
>tracheal.


I found an article somewhere...don't remember where. I think a 
"Gleanings" from the 80's. Tracheal in the UK all but disappeared, 
with a big spike about 20 years after the initial losses. Acarapis 
then became a minor pest. I believe that Maine bees had a spike in 
Acarapis last year or the year before...Bill?...about 20 years after 
the initial losses.
Mike 

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