oxalic acid strength

[Finman]

.
I have collected on Finnish beekeeping forum best European oxalic acid researches
http://bee.freesuperhost.com/cgi-bin/yabb2/YaBB.pl?num=1163318930

European varroa group. You may seach reports by their name.
Coordination in Europe of research on integrated control of varroa mites in honey bee colonies
http://ec.europa.eu/research/agro/fair/en/se3686.html


Clear advices from Canada http://www.agf.gov.bc.ca/apiculture/factsheets/221_varroa.pdf


Oxalic acid vapour treatment
http://www.dave-cushman.net/bee/oxalicthorne.html
http://www.honeybeeworld.com/diary/articles/cor.htm



Harms to brood area if you trickle during summer. Results are worse than what mite can do

http://cat.inist.fr/?aModele=afficheN&cpsidt=17485001



How soon mites die when you give oxalic cure - After two week you see the result

http://www.dave-cushman.net/bee/oxalic.html


Oxalic acid levels in human bodyhttp://www.emea.europa.eu/pdfs/vet/mrls/089103en.pdf


Oxalic cure and human health - oxalic acid residuals classification means that the substance is evaluated as not dangerous, and no residue limit is needed to protect the consumer.

http://cat.inist.fr/?aModele=afficheN&cpsidt=16374464

http://www.neurobiologie.fu-berlin.de/menzel/Rademacher.html


OA in human food stuffshttp://www.nal.usda.gov/fnic/foodcom...er/oxalic.html
http://growingtaste.com/oxalicacid.shtml
http://cat.inist.fr/?aModele=afficheN&cpsidt=14942975

 

[gavin]

I know several European bee researchers, but that is not the issue.

(for Bee-Key-Pur: Boom ... boom ... boom.boom.boom ... dah dah dah de dah de dahhhh ..... )

 

[gavin]

I have read the NZ handbook before you.

How do you know that? I think that I read it in 1999.

 

[Finman]

How do you know that? I think that I read it in 1999.

Yes yes

In appendix 3 it is said: • To produce a sugar syrup with 3.2% oxalic acid (w/v), mix 1 litre of water with 1kg of sugar. Add 75 g of oxalic acid dihydrate. Mix thoroughly.

You you believe that there is a mistake in that w/v

 

[gavin]

Yes yes

In appendix 3 it is said: • To produce a sugar syrup with 3.2% oxalic acid (w/v), mix 1 litre of water with 1kg of sugar. Add 75 g of oxalic acid dihydrate. Mix thoroughly.

You you believe that there is a mistake in that w/v

I do. The 3.2% is a 'theoretical' weight, as the substance weighed out would be the dihydrate. The actual weight per litre of syrup would be 4.5%.

Remember, a litre is a measure of volume.

 

[broandy]

Yes yes

In appendix 3 it is said: • To produce a sugar syrup with 3.2% oxalic acid (w/v), mix 1 litre of water with 1kg of sugar. Add 75 g of oxalic acid dihydrate. Mix thoroughly.

You you believe that there is a mistake in that w/v

This is correct Finman
This is the amounts I make up Finman

 

[Finman]

Remember, a litre is a measure of volume.

The Power may be with your metric system!

Definition

The kilogram is the only one of the SI units which is still defined in relation to an artifact rather than to fundamental physical properties. It is also the only base unit that employs one of the prefixes.

The kilogram was originally defined as the mass of one litre of pure water at a temperature of 4 degrees Celsius and standard atmospheric pressure. This definition was hard to realize accurately, partially because the density of water depends ever-so-slightly on the pressure, and pressure units include mass as a factor, introducing a circular dependency in the definition of the kilogram.

 

[Finman]

This is correct Finman
This is the amounts I make up Finman

So do I, but can you explain that w/v

 

[Finman]

I do. The 3.2% is a 'theoretical' weight, as the substance weighed out would be the dihydrate. The actual weight per litre of syrup would be 4.5%.

.

OK GAVIN!

You mix 1 kg water and 1 sugar. its weight is 2 kg and the volume 1.6 litre

Would you calculate the oxalic syrup content

1) water % w/v
2) sugar % w/v



Let me see the calculation.

I cannot understand theoretical and actual weight: What are those?
"In theory the bee does not fly but acually it flyes? " HOW?

 

[Bee-Key-Pur]

I know several European bee researchers, but that is not the issue.

(for Bee-Key-Pur: Boom ... boom ... boom.boom.boom ... dah dah dah de dah de dahhhh ..... )

HOW did you know that, Blackadder is my next best entertainment....lol

Brian

 

[gavin]

Well then ....

[ame="http://www.youtube.com/watch?v=TkZFuKHXa7w"]http://www.youtube.com/watch?v=TkZFuKHXa7w[/ame]

 

[Bee-Key-Pur]

Thanks, I haven't seen that one...

Brian

Blast, you re-posted before I could send...lol

 

[Bead]

I bought the 6% solution from Maisemore's, but got a bit concerned after reading all the posts on this thread. So I asked them. Speedy and helpful reply: "We use ours at 6% but if you want to dilute it to 3% or whatever you fancy just put sugar syrup in it to dilute it."

 

[Bead]

Thanks to Gavin for the dilution advice. Treated the girls just now: used dilution rate of 25g sugar and 15ml water added to 100ml of the 6% solution. It was a lot easier using one of the Trickle 2 bottles to dispense the mixture. Only have one hive on brood-and-a-half so it was nice to see the girls clustered in a tight ball between the two levels. They were as good as gold during their treatment so left a couple of slabs of fondant for a treat afterwards.

 

[Heather]

Hmmm dont know whether to worry or be pleased- that's bee keeping!

I did my usual Oxalic trickle mid December - it had been freezing for 2 weeks before so I doubted any brood.
This year I have only had about 15-20 varroa drop each hive.
Now - did I twonk up my trickle? - or are the bees coping and removing varroa themselves better this year.
Last year same solution I had about 2-300 drop.
Have to say during the summer I only twice saw a mite actually on a bee, so the hives looked good.
Ah well, time will tell. Cannot do anything about it now

 

[beeboybee]

heather i am the same, i did not see a mite at all last year still treated but undicided on the oxalic yet, so will just have to wait and see, do you think there was less verroah around last year?

 

[Finman]

heather i am the same, i did not see a mite at all last year still treated but undicided on the oxalic yet, so will just have to wait and see, do you think there was less verroah around last year?

every hive has its own varroa situation. You cannot trust on what others have.

Varroa douple itself about in one month. If the hive robs the weakened colony by varroa, robbing hive may die in one month.

 

[BKF Admin]

Hmmm dont know whether to worry or be pleased- that's bee keeping!

I did my usual Oxalic trickle mid December - it had been freezing for 2 weeks before so I doubted any brood.
This year I have only had about 15-20 varroa drop each hive.
Now - did I twonk up my trickle? - or are the bees coping and removing varroa themselves better this year.
Last year same solution I had about 2-300 drop.
Have to say during the summer I only twice saw a mite actually on a bee, so the hives looked good.
Ah well, time will tell. Cannot do anything about it now

I chated with a few local beeks last Autumn about Verroa levels as my mite count was well down as well.

The feedback I got was that everyone had a lower count than 2009.

 

[beeboybee]

its hard not too worry when you dont see them though!

 

[oliver90owner]

robbing hive may die in one month.

Finman,

Surely treating two or three months later would not be the recommended route? They may be dead by then?

Regards, RAB