>  Waldemar asked:
>>Is there any risk from the OA treatment to open brood or very young 
>>laying queens?


Waldemar, I wrote to an honeybee scientist/entomology professor I know, who 
has been studying Oxalic acid use for Varroa control. I asked about 
multiple treatments and brood kill. Here is what he wrote back.

The most intense test that we did was 3 treatments at 7 day intervals in 
July using a 6% solution (much stronger than needed).  We did not see any 
evidence of brood or adult bee injury and we examined the colonies 
carefully.  We also found that we were not able to control mites very 
effectively when colonies had 7 or more frames of brood.  The only thing I 
can tell confidently is that treating broodless colonies 1X with 50 ml of a 
3% solution is highly effective if treatments are applied between 32 -55 
degrees F.

I don't know why the difference between the Greek study and the US study.
Mike



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