Apologies in advance for going to the list before going to the books,
but the list is here and my books are home, so here is my question.
 
I seem to recall that there were problems with formic acid prompting
queen rejection and/or supercedure if used in uncontrolled or high
concentration, which is why it was not a favorable means of varroa
control.
 
Comments anyone?
Regards,
Aaron Morris