Studys show OAV kills more mites in a brood less situation, but OA trickle drops mites for a longer peirod of time... ie mite peak drop is usaly 6 or so days. Studys are showing that when used brood on it kills more mites, it seems the longer action time alows it to contact more mites as they emerge and thus kill more mites even thow it kills a lower prestantage of mites exposed to it
"Significantly more mites fell six days after OA application than 2 or 4 days after OA application. This statistic may be interpreted several ways. One interpretation is that OA has residual activity against varroa for at least six days post-treatment. Charrière et al. (2004) and Gregorc and Planinc (2004) report that mite fall can occur over a 3 week period in hives treated with OA Aliano 2008 refereeing trickle https://digitalcommons.unl.edu/cgi/v...tomologyfacpub
Randy Oliver starting to release info about his small scale trial putting them head to head on bee l, and his results backing the above studys I thought I would open a full topic on it
"I can share some data from a recent experiment in which I tracked mite drop and alcohol wash counts in four test hives, full of brood, in late spring. Two hives were vaporized (one with a Varrox, one with Provape 110), and two dribbled with OA in solution (one with 1:1 water : sugar, the other with 1:1 water: glycerin). I then reapplied the vaporizations (but not the dribbles) at days 10 and 19.
The glycerin dribble caused by far the greatest initial increase in mite drop--the other three were about the same. The two dribbles resulted in the best mite reduction initially, but by Day 26, all four colonies exhibited roughly 50% reductions in their alcohol wash counts from baseline--after a single dribble, compared to three vaporizations at roughly 10-day intervals. Keep in mind, that there was an n of only one for each treatment, so don't run too far with this data.
The above results suggest that the added humectants increased the efficacy of the OA greatly--initially as well as over time, and indicate that the
effect of the crystals from vaporization is very short term (this is supported by Saskia Schneider's findings)". http://community.lsoft.com/scripts/w...L&D=0&P=115030
it took 3 OAVs to have the same effect as one dribble
The 1st response from many will be the OAV wasn't done right, ie "why 10 days apart instead of the more standard 4-7 often given" the answer is here http://scientificbeekeeping.com/the-...oblem-part-15/
The good news for many is the high speed type vaporizers did not seem to suffer performance compared to the slow pan type!
as he said, don't run too far with with it, hopefully there is a larger trial coming.. along with a article with deeper details