(( Leading a Varroa Management workshop this weekend,  so tying up loose ends that have been bothering me)).

The return interval for OAV treatment is the subject to idiosyncratic recommendations.   Can someone cite a published source for comparative efficiency and safety of different return intervals.    

I have seen periods of 4-7 days recommended.   Typically the recommendation appears based on inductive reasoning about open brood (and/or uncited factoid about the average phoretic period of mite mothers).

Any trials actually done of behavior of colonies under different return intervals ?

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