Regarding varroa:
 
Formic acid and oxalic acid have been used in Europe for some time.  We
need to get them OK'd here in the USA.   Formic works with brood.  Oxalic
is better when there is no brood.
Since the bees are formic acid this is as natural as it gets.
 
 
   Jim Jensen         Atlanta, GA         [log in to unmask]
 
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Jim Jensen
Atlanta Georgia
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