Regarding oxalic acid damage, will be interesting to hear how many times  
those beekeepers with CCD
used oxalic to control mites over the course of the year.  Did they  use only 
once or many times?  I like to use minimum treatments necessary to  achieve 
results, I have found more is not always better with IPM.  I found  when using 
Apistan that the majority of the mite knockdown through my screen  bottoms 
occurred within 4-5 days and I didn't need to leave on longer for my  hives to 
survive winter.
 
Jerry Wallace
Atlanta, Ga
 



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