Beemaster's International Beekeeping Forum
BEEKEEPING LEARNING CENTER => DISEASE & PEST CONTROL => Topic started by: Finsky on September 05, 2005, 02:30:09 am
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Varroa arrive over russian border 25 years ago to Finland.
Many medicines have used and are just now used.
Oxalic acid is now most succesfull method. Our main beekeeping consultant Ari Seppälä says that 70% of hives are handled with oxalic acid solution.
Damades for bees and quees are few with liguid. It is given at late autumn and there are no brood in hives. Vaporazind with any medicin needs quite high day temperature and early hanling. Liguid is good to give when day tempeterure is +5C or +41F. Vapour helps to thracea mites.
Handling I very cheap. I just bougt half a kilo oxalic axic crystals and price was 5 € or 6 US dollars. With that price I can handle 200-300 hives.
And again:
Oxalic liguid Metdod is very easy. It must be done during winter when bees have no brood.
If you have mites much, you can take brood off and after that you give oxalic acid.
You prepare the solution and spray it with vaccination sprayer (large needle) in the gap of frames.
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Hive must be without broods. If you have palm size brood area, it may contain 20% of hives mites. (But to do is better than for nothing.)
Take 7,5 gr oxalic acetic powder into 1 dl warm water.
Take 100 gr sugar and dilute it in the solution.
(Euro coin is just 7,5 g. You can weight your coin and you can use as weight. Own balance is easy to do. Our coin weights are in internet.)
This 1,6 dl volume is enough for 3-5 hives, depending of the amount of bees .
Drop 4 ml solution in the gap of frames, which is full of bees from edge to edge.
Do not give for one box hive more than 40 ml, and this only for hive which is totally full of bees.
Do not give for 2 box hive more than 50 ml.
Weather can be cold, so bees are in the winter ball. +5C is good weather.
DON'T GIVE TWICE HANDLING. It is harmfull.
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Finman --
Is this the same chemical you use?
http://www.chemistrystore.com/oxalic_acid.htm
The fact sheet indicates it is a 100% formulation.
-- Kris
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Finman --
Is this the same chemical you use?
There is only one oxalic acid but it has synonyme names. It is 100 % pure crystals.
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In the US you can find it at Ace Hardware or other hardware stores in the paint department as wood bleach.
Oxalic acid vapor is not very dependant on temperatures. Not any more than trickling. I wouldn't want to trickle when it's cold and the bees are clustered and I wouldn't want to mess with them at all with they are clustered. But you can vaporize the Oxalic any time. Ambient temperatures are not critical.
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I wouldn't want to trickle when it's cold and the bees are clustered .........
Think that bees are you slaves and you can do with them what you want.
Have you heard " Whom he punishes that he loves".
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You don't think that trickling when the weather is cold and the bees are clustered would harm them? Being wet when they are cold sounds like a bad idea to me. But I've never tried it.
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You don't think that trickling when the weather is cold and the bees are clustered would harm them? Being wet when they are cold sounds like a bad idea to me. But I've never tried it.
Yes! I thought same also. It seems really bad when you do it, but it does no harm bees.
But think about. Our winter is much more longer that if yours, and no harm.
No one knows, how oxalic axid kills mites but it does.
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Does oxalic acid have any effect on small hive beetles, too?
-- Kris
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If anyone with SHB tries it, please let us know.
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Is it possible to use a spray bottle or would that take too long to dispence the oxalic acid?
David
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Is it possible to use a spray bottle or would that take too long to dispence the oxalic acid?
David
It is not a meaning. The aim is to get droplets into the winterballa so every bee get contact to oxalic liquid. So no spaying.
The best is vaccination tube. So you se how many milliliters you give.
Is too long 20 seconds per hive.
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Just to clarify Finsky - you only do this once per year correct?
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Just to clarify Finsky - you only do this once per year correct?
Only once when bees are in winterball. Two cures are harmfull. Once done there is no sign about harmfull efects.
I have not done it yet. Today it was 3 inch snowfall. I wait for better weather.
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Here’s a good reference book (about 130 pages) on various treatments for varroa. The book was first published in 2001, so it does not contain information on sucrose octanoate (Sucrocide), but most of the other options are discussed (including oxalic acid).
Concerning oxalic acid in syrup:
“The colony should be broodless, and the syrup should be lukewarm to avoid chilling bees. Outside temperature should be above 0º C. The oxalic acid does not work through evaporation, so temperature is not as important as it is with essential oils or formic acid.â€
It can be downloaded at this site:
http://www.biosecurity.govt.nz/pests-diseases/animals/varroa/
At the site, scroll down towards the lower part of the document to:
‘Varroa Management Documents’
then click on:
‘Control of Varroa: A Guide for New Zealand Beekeepers’
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WHAT TYPE OF DISPENSER ARE YOU USING TO TRICKLE OXALIC ACID? ALSO MY ACE HARDWARE DOESN'T HAVE IT. WHERE ELSE MIGHT I FIND IT? COLVIN
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I found some at Home Depot, back with the strippers and such. It's Savogran Wood Bleach, and the label says Oxalic Acid in smaller print in the upper right corner. The spec sheet from the company lists Oxalic Acid Dihydrate as the ingredient, 95% -- 100% by weight.
-- Kris
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I bought my oxalic acid from pharmacy. Even tehre it is cheap. I gived just today liquid on bees.
Next weekend I will see how much I had mites. No need to calculate. Glance is enough. I have a bee race which should kill mites. That's what I want to see. Last autumn they had no difference.