>In what way do you think that [thymol] is tougher?  We have used only
thymol crystals since 1997 when varroa arrived and have not had any issues
other than queens sometimes going off-lay for a few days.

I've also used a great deal of thymol.  In order to get a good mite kill, I
find that we need to apply enough to kill some sealed brood--no big deal.
 And the bees and queen often avoid the area near the treatment.

On the other hand, with oxalic dribble, there is not *noticable* brood
kill, the queen appears to be unaffected, and the bees seem quite happy
afterward.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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