>  The problem with OA from the research I have done is keeping the hive below
>varroa threshold until the broodless period.


Exactly, Bob. Which is where breeding comes in. The VSH (SMR) bees keep the 
mite levels down to a level where the colony will reach the broodless 
period, without crashing. The colony can then be treated with OA, cleaning 
up most of the rest of the mites.
Mike 


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