>
> 1. Is there now a confirmation of the action by which oxalic acid acts as
> a miticide?
>
Can't say that there is complete understanding, since an acid has so many
biological effects.  Try hopping into a bathtub full of sulfuric acid to
see (just kidding, DON'T play with strong acids).  Anyway, OA has quick
action when it contacts the mite's foot pads (empodia).

>
> 2. At what rate can one expect OAV to kill brood, and if it kills brood,
> of what age(s)?
>
I haven't personally noticed an adverse effect upon brood.

>
> 3. Is the queen's health or fertility affected by OAV?
>
I haven't noticed an adverse effect upon the queen either, even with
repeated doses of 2 g OA.  Obviously, there would be an exposure level when
it would start to harm the bees.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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