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Not exactly but in the 2014 research , they monitored the drop every two days after the Initial (only) OA sublimation. This is shown in Figure 1 of the research report as a graph. It showed a peak of about 230 mites dropped at two days, a further 120(ish) after a further two days and maybe a...

I grew the Muskotka variety for the first time this year and grew three plants in a large pot on an outdoor deck. I grew them as bush plants but, as Phil found, I needed to put support canes in place to support the weight of the fruit. Apart from being prolific, it was also very tasty and no...

Let's throw some numbers at this issue. Suppose you use 2.25g of OA to treat the interior of your beehive, which consists of a brood box and a super with 10 frames of uncapped nectar/honey. Let us assume that half of the sublimated OA find its way into the the super and that all of that OA...

ISO 9001 was explained to me as "It means that if you follow your documented procedures, you will produce a safe product or service that meets the customer's requirements" - it does not necessarily mean that your product is safe and meets the customer's requirements. I think that's the essential...

Exactly! How many academics have written learned papers over the last 60 years and swallowed 'varroa feed on the hemolymph of bees' without questioning it until a young graduate student in the USA thought "that does not like a blood suckers digestive system and that's not what I'd expect as poo...

When LASI did its now infamous 'dig out the brood' research in 2013, it reported that it used "dihydrate OA, purity 99.6% (Sigma-Aldrich obtained from Riedel-de Haen, Enologia Apicoltura". 99.6% is the sort of purity you can now buy on ebay for cleaning boats but if you were applying for a...

Ratnieks may not have been the lead researcher on the project. Hasan Al Toufailia and Luciano Scandian worked on the project as well. It was done largely in January 2013 and the final bit, where they honed in on 2.25g of OA for the best results with vaporising, was done in December 2013, so it...

The research into OA as a treatment against varroa done by LASI in 2013 and published in 2015 was, I think, intended solely to compare three methods of delivery (spraying, drizzling and vaporising) at three different doses (four in the case of vaporisation). In order to do the comparison, they...

If I recall correctly, LASI found that vaped OA was effective for 8 to 10 days BUT my observation would be that founders mites that escape the OA could return to a brood cell, if there is brood, within 5 days so I’d prefer 3 x 5-day intervals - 2.5g of Apibioxal or other OA-based product...

Plus, if you look here, you'd get a pretty good idea of the bee mortality from doing Dani's "accelerated drops with OAV" (spoiler - not very many!). CVB

I have had UFEs for over six years and this year is the first when I felt the need to close up the atrium to protect the bees from wasps. What I did six weeks ago was fashion a piece of plywood to block the whole atrium/landing area but left a small (30 x 30mm) hole in one corner. That seemed...

Nature hates a vacuum. When a member asks a difficult question, possibly one with no known answer, the thread hangs there for a while with no responses. Nobody likes to see that so what tends to happen is that somebody will post a response vaguely relevant to the question, sometimes humorous and...

Speaking of peer-reviewed evidence, JBM, have you seen anything written, based on evidence, of how Oxalic Acid actually kills Varroa mites? The assumption that I have repeated has always been that the acid attacks the feet and mouth parts of the mite (i.e. the soft tissue). Are the mites...

The annoying aspect of the video is the almost constant view of Sammy rather than his slides. Notwithstanding this minor complaint, it ought to be compulsory viewing for all beekeepers. Candidates for the Basic qualification should have to answer questions on it. But, beekeeping being what...

Sorry but I don't have any jokes or 'bon mots' but here is the definition of honey from the 2015 Honey Regulations: In these Regulations “honey” means the natural sweet substance produced by Apis mellifera bees from the nectar of plants or from secretions of living parts of plants or excretions...

Dani, No issues with wild comb in the 50mm airspace above the frames (in the eke) for the three weeks of the OA treatments? CVB

So, when you place a heater under your over-wintered hives, what gain, in terms of time, do you think you obtain compared to your friends who do not use heaters? CVB

I started watching the first video and after about 10 minutes, I'd lost the will to live. Maybe a telescopic roof made of 50mm Celotex is the answer? CVB

Eighteen months ago, this thread raised the question of using low power heaters to get queens laying eggs earlier than would otherwise be the case. Did anybody follow up on this and use a heater for earlier brood? Finnie, my lovely, how much do you think your heaters bring forward the (drone)...

You've made a very valid point and, thinking about it, it reinforces the idea of treating a whole apiary rather than just selected colonies in order to catch the collapsing as well as the strong (robbing/refuge?) colonies. When there's brood, 3 or 4 vapings with Oxalic Acid should clear a...