Bill, as best I can tell, the immediate effect of dribbled or vaporized OA
upon mite drop lasts for only 2-3 days. There may be additional delayed
effect not evident in the rate of mite drop. This is why it appears to be
important to repeat vaporization at approx 4-day intervals.
--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com
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