>
> > to either isolate that hive, or treat the hive only..... to bring it
> back to under threshold.  Therefore giving a gap before full treatment
> across all hives.


That's a great question Fiona.  With the high cost of registered treatments
in the U.S., it is actually cheaper for us to wash a hive than to treat.  I
could save a lot of money by only treated those hives that have high mite
levels.

I've yet to see any study as to the efficacy of doing so.  It would depend
a lot on the surrounding bee population outside the apiary.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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