Agree that a brood break of a few weeks is theoretically and in 
practice not that effective at bringing down varroa numbers, certainly 
not in the order of magnitude of effective acaricides, hard or soft.  
About five plus years ago there was a study out of Europe in which they 
did some elaborate confining of queens, promoting of drone brood 
production, and switching various brood combs around in a fairly 
elaborate and timed scheme.  The knockdown of varroa was very good from 
my recollection.  A good result, but is it worth the cost in elaborate 
management?   Cannot recollect the publication.  Maybe Journal of 
Apicultural Research.

 

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