>
> >If a percentage of the colonies in the yard or operation reaches the
> threshold, the whole yard or operation needs to be treated.


And that's exactly what we have done and continue to do.  And as with
Charlie, we try to piggyback as many things as possible at each opening of
a hive.

As I tried to make clear, the math works out for to sample every hive only
if one is using an expensive legal treatment, and if the majority of hives
have far lower mite levels than the few.  Even so, washing that many
samples, even with a wash table, is tedious work, for which life may simply
be too short.

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

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