>> I treat with OA in November / December only.  
Should I assume this is with a vaporizer?

I did think I would have to come up with a vaporizer set-up to ensure good coverage but trickling is so easy and, I believe, as effective as vaporizing as long as there is no sealed brood.  The Swiss institute's trials from a few years ago showed very high varroa kills [in the high 90%'s I recall when done properly].  As long as the colonies do well, I don't have to kill every single varroa.

I trickle the OA/sugar water solution from a graduated 30cc syringe.  It takes way less than 5 minutes a hive.  [I do use a beam scale for the OA amount and a large graduated syringe to measure off the sugar water amount to get the proper solution mix.  It's key to get the right solution concentration.]

Waldemar

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