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Date: | Sat, 1 Oct 2016 11:15:37 +0000 |
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Frank, In your note you said it works in the bottom super only, are you referring to just the standard hive body? Implying that the vapors wont rise in a larger hive??
I use standard Langstroth boxes with front opening slides (English design about 2000) as I have my hives in pairs on pallets. The bees will start fanning the second you close the slide and if you don't wear a mask, you get it straight in your face. Vapour is mostly gone overnight.
I have taken hives apart after an hour and the bees will have started to move on to the top bars of the bottom super (that's with a double dose) and yes on hot sunny day, the grass will be burnt.
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I wanted to see how effective a single 40 ml dose worked as I also pull drone comb as part of my mite control so tried it with a full drone comb left in the second super. It clears off phoretic mites but wasn't sufficient to keep up with the mites breeding in such a big slab of drone comb away from the immediate effects of the acid. I was applying Formic once a week and looking at mite fall daily over a month. Hives without much drone comb had greatly reduced mites. Our real problem is in winter when other hives around you are dying and I'll get plastered with re-invasion hence the need to treat in winter.
I learnt this at EAS last year. Canadians now have a different formular where they start at 40 mls and take off a ml for every degree of temperature to stop bee damage on hot days. eg 40 - 15 degC = 25 mls
l'lI see how this work under our conditions. We also don't have very hot days where I live; 25C in summer is a hot day on the coast, 30 deg C inland but we also have wind! I hope this helps
Frank Lindsay
Wellington New Zealand
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From: Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]> on behalf of Juanse Barros <[log in to unmask]>
Sent: Saturday, 1 October 2016 2:48:23 p.m.
To: [log in to unmask]
Subject: Re: [BEE-L] Formic vapours
On Fri, Sep 30, 2016 at 9:17 PM, Richard Cryberg wrote:
> Jaunse said that higher concentrations of formic on the bottom board would
> kill the varroa that fell off the bees as a result of formic exposure up in
> the hive. I just do not think there would be a significantly higher formic
> concentration on the bottom than you found higher in the hive for strips
> placed on top of the bars.
>
> I have no opinion on how good formic strips would work if placed on the
> bottom board.
>
Me neather and I think we are talking flash treatment and not necesarily
strips. What I am saying is that you get a better kill if you MECHANICALLY
ie. closing entrances and cracks, allow formic vapours to build up on the
bottom board. At least that is my understanding with formic acid use. I
have never used MAQs strips.
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