Nigel check out this topic:
"Varroa checks"Just one Topic of many, demonstrating another good example, loaded with good information concerning OAV treatments, (as well as other type mite treatments) which can be found here at
Beemaster, such as the following example. The following was experimented with, researched, and posted by our very on member.
"Coolbees" Re: Varroa checks<<
Reply #14 on: July 19, 2021, 01:03:21 am >>
... Treatment day 1 then wait till day 7 retreat. The problem is Varroa exiting their capped cells between days 2 and 6....
I also do 3-day treatment cycles with OAV, for exactly the reason you state. Only, I usually try to treat 9 times (27 day total).
I did mite counts and sticky board drop counts on every hive during treatment - for 2 years. I collected all the data. Based on that data, I now: treat in August (once yearly) & don't count mites. This is what has worked for me, in my area. My bees don't get a brood break due to winter, but they do have a dearth from August till November.
My average mite drop counts would look like this (counted on the 3rd day after each treatment, just prior to the next treatment):
900
900
900
450
300
300
280
320
18
As you can see, the last 2 or 3 treatments seemed to catch a goodly qty of mites, before the drop counts really fell.
I know they say that OAV "stays effective" for 3 days, but my notes showed very little increase in mite drops after about 30 hours post-treatment. Suggesting to me that efficacy drops off quickly.
My data definitely has proven - to me - that a 7-day OAV treatment cycle would not work. Fwiw.
Ben Framed"quote""Thanks for sharing this Cool... Good stuff!!"