>I will  find the queens in all hives in the spring and put each in a 3 frame 
nucleus box without any sealed brood. I can vaporize oxalic in the nuc boxes 
at that time and get all their  mites. The main colonies I will leave to 
raise their own queens. It takes 13 days till the queen emerges and another 
7 days before she is bred and laying eggs. At this time there should be no 
sealed brood left in the main hives and I can vaporize the oxalic in them at 
that time.


If you do this in spring I think you would need to watch when all the drone cells emerge to get all phoretic mites. Unless your goal is to double the size of your apiary with the nucs, why not just cage the queen for 14-16 days, right in the main colony, and then treat during the one or two-day broodless window that will occur?  

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