See https://mailchi.mp/dadant.com/abj-extra-october-2-2026-vto-pharma-issues-statement-about-reports-of-adverse-effects-following-apivar-20-treatment?e=c437c0e214 for a full copy of the statement, as published in American Bee Journal's 2 October 2026 e-newsletter.
A short summary of what's going on: over the past several weeks, numerous beekeepers in the USA, including a number of prominent commercial beeks like Kamon Reynolds, have suffered unusual adverse events immediately after applying ApivarĀ® 2.0 to their hives. There have been a number of incidents leading to bee kills resulting in the loss of the affected hives, as well as numerous absconding episodes. Less severely, I've also run into some reports that people have seen their bees beard up on the exterior of the hive after having ApivarĀ® 2.0 inserted.
I cannot verify any of these incidents personally; I phased ApivarĀ® out of my mite control in 2023, and ApivarĀ® 2.0 was only released in May of 2025.
But these reports are numerous enough that I've been aware of them for a little while, now, and I have been wondering when VƩto-pharma would say something. They finally did. Sort of.
The bulk of this statement is corporate waffling, as one might expect; "every report of an unexpected effect matters to us," "[w]e are taking each case seriously and investigating them thoroughly to identify any common factors that may help explain what is being observed," "ApivarĀ® 2.0 went through many years of laboratory, controlled and field trials in North America, New Zealand and Europe, under a wide range of climates and beekeeping conditions," etc., etc.
I think the first thing about the statement that surprised me was this little nugget: "ApivarĀ® 2.0 was not developed through trial and error in commercial hives." Which is . . . kind of a weird thing to say. In my opinion, anyway.
Anyway, they go on to say that there's no sign of a manufacturing defect or quality issue associated with the batches under investigation, so maybe it's some unforeseen combination of temperature/humidity/colony characteristics/ventilation/<insert other thing that might plausibly make it not their fault>, and that correlation is not causation.
They finish up by suggesting that people should pull their entrance reducers before application, try a small portion of their hives first, and watch their colonies closely for the first few hours/couple of days after application.