I collected one colony from a house a while ago that had loads of 
varroa.  (The first varroa infested feral colony for me ever.)  I 
gave them a virgin queen from my 'preferred stock.'  At this point 
the colony's brood has emerged and the new queen started laying 
several days ago.

I do see varroa on the adult bees and would like to knock them down 
with oxalic acid.  I understand that varroa will dive under larvae 
just prior to cells being capped.  The oldest larvae in this colony 
has maybe 3- or 4 days old so it seems that all the varroa will be 
exposed to the OA.

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

Thanks.

Waldemar
Long Island, NY

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