>
> >I have bee yards that have 12 - 14 colonies in each and I run into a three
> year "wall" if not treated.


Thanks Richard!  This is exactly what I am wondering--whether the "3-year
wall" is common.
Those beekeepers who claim success against varroa following major splitting
or installation of packages are still early on the build up curve for the
mite.

What I want to know is about those whose bees are holding their own in the
long term, without major splitting or restarting every year.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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