>
> > This long-term negative effect of oxalic acid on bee colonies has not
> been reported before. Although the efficacy of oxalic acid is very high in
> autumn when there is little brood, the detected negative long-term
> sideeffects on colony development require more thorough studies to
> determine the reliability of its use."
>
> >I am sticking with thymol.


I don't know whether it would qualify as a long-term study, but I have
applied oxalic dribble to my entire operation of several hundred hives
every Nov or Dec for at least 5 years.  Those bees then must be very strong
and healthy for almond pollination by February 15.  They have been--great
brood buildup and colony strength.

Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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