>A question I have is if I find even 1or 2 relatively high mite counts in a
yard of 24 hives is it best to treat

> the whole yard?


That is a logistics/economic decision.  Once you start running enough
colonies, you generally start managing by the yard, or by the entire
operation, since it takes too much time to manage every hive individually.

Also, if one is breeding from one's stock, then individually treating hives
then makes it impossible to compare them later for innate mite resistance.
If I treat one hive in my operation, I treat every hive identically at the
same time, so that I can later select breeders from a pool that has all
undergone identical treatment.

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

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