>> Do you have*any*  treatment for chalkbrood?
> For what it's worth:
> http://www.beevital.com/page/pagina-mycostop

What *is* it worth?  Does it work, or is it just more snake oil?

In my experience, chalkbrood is a spring malady and clears up 
spontaneously after one brood cycle.  By the time you see it, the worst 
is over.  After the chalkbrood round, there may be a few cells, but 
nothing worth worrying about.

So I wonder: how would one ever know if it works?

The only way to evaluate it as far as I can see would be to predict -- 
or cause -- a chalkbrood outbreak and run a controlled test.

As for employing it in practice, I would think that it would have to be 
use prophylactically.

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