Both OAV and dribble.
A good history of OA Varroa control from Medhat,a true asset to the beekeeping community who has worked on the organic acids for many years.
Cameron Jack discussed the results of 2 experiments he performed on colonies with brood in Sept in Fla.One on Q confinement,then vaping.This is used successfully in Europe in July but did not work in Fla in Sept.(Bee population never recovered from brood break).The other concerned application rate for vaping.(1-4 gr per box)
Some confusion for many listeners (and moderators re:Glycerin)who weren't familiar with terminology and practices.Cameron used singles and Medhat doubles.
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