Oxalic acid dose

[jeff33]

More and more beeks seem to be using OAV as their preferred Varroa mite treatment. While there is a fair bit of write up on it, there doesn't seem to be much in terms of how much to use other than between 1-2.5gr and what to consider to adjust dosage.

I use 2.5gr for my strong hives, 2gr for smaller hives and 1gr for nucs. I will repeat every 5 days until I can't see anymore drops. But should the dosage be in relation to the infestation rather than the size of the hive?

 

[Angry_Mob]

Was a similar thread recently about this, madasafish suggested there is a tolerance of +1g. https://beekeepingforum.co.uk/showthread.php?t=42852

Personally I'll be going for 3g for hives as I vape through the floor and 1.5g for nucs and keep the dosage consistent rather than adjusting.

 

[jeff33]

I missed that thread, thanks for pointing out.

 

[Erichalfbee]

All hives get 2g

 

[Eyeman]

Doesn't it say how much you need to use on the Apibioxal packet?

 

[jeff33]

I had mine before apibioxal, it doesn't say anything on it.

 

[Eyeman]

I had mine before apibioxal, it doesn't say anything on it.

So it's no longer legal?

 

[jeff33]

It is so long as I don't get bursted ��

 

[Beefriendly]

Worth remembering that it's difficult to Overdose the bees; so adding more is not going to increase or decrease the effectiveness of the treatment. When you see how much condenses on an open mesh floor, you'll buy a sublimox.

 

[For want of a better word]

Worth remembering that it's difficult to Overdose the bees; so adding more is not going to increase or decrease the effectiveness of the treatment. When you see how much condenses on an open mesh floor, you'll buy a sublimox.

And vaporise from the top using an adapted eke ( Do not forget to remove the rhubarb leaf before vaporising!)

Varomor vaporizer worked well using this technique last season

Yeghes da

 

[Beefriendly]

)

Varomor vaporizer worked well using this technique last season

Lets not fog this up Hoppy...it's NOT a sublimator.

 

[charlievictorbravo]

An experienced and knowledgeable beekeeper told me yesterday that colonies should not be treated more than 10 times a year with OA-based products. She cited advice she had about the use of VarroMed (the Hiveclean successor).

I had not heard of such a limit nor had I heard of any reported problems of overdosing bees with OA, either in terms of frequency of treatments or quantity of OA used.

Does anybody know of any research where limits on the use of OA are suggested and backed up with proper research?

CVB

 

[jeff33]

Scare mongering to buy another product?

 

[SDM]

Scare mongering to buy another product?

Or motivation to cycle treatments which is no bad thing. I've given some fairly hefty doses at times as much as 18g over 20 days to one., 15g in 20 days to all with zero issues.
One queen had had 35 treatments before she croaked at age 5.

 

[charlievictorbravo]

I have been directed here, which gives details about the use of Oxybee, a German product that is mixed into a sugary liquid and dosed into the gaps between the frames (seams)in a broodless colony - like our dribble method.

It says ' increased bee mortality was very commonly observed' and 'Repeated treatments are not well tolerated by bees. If worker bees are treated more than
once per generation, it can result in damage to the bees and a reduction in the strength of the colony'

I'm not sure that these observations on the use of a specific commercial treatment are automatically transferable to all OA products and methods of delivery. Will anybody who is familiar with this type of document care to express a view?

CVB

 

[madasafish]

I have been directed here, which gives details about the use of Oxybee, a German product that is mixed into a sugary liquid and dosed into the gaps between the frames (seams)in a broodless colony - like our dribble method.

It says ' increased bee mortality was very commonly observed' and 'Repeated treatments are not well tolerated by bees. If worker bees are treated more than
once per generation, it can result in damage to the bees and a reduction in the strength of the colony'

I'm not sure that these observations on the use of a specific commercial treatment are automatically transferable to all OA products and methods of delivery. Will anybody who is familiar with this type of document care to express a view?

CVB

http://scientificbeekeeping.com/oxalic-dribble-tips/
http://www.dave-cushman.net/bee/oxalicdribble.html

First link - read it all..



This appears definitive?
https://www.researchgate.net/public...repeated_summer_application_of_oxalic_dribble

"Oxalic acid (3.2% w:v) was applied by the dribble method to colonies of honey bees over a warm-season period of 9 consecutive months to evaluate the effect on; 1) varroa infestation, 2) colony strength, and 3) nosema prevalence. Treatment resulted in effective varroa control, did not appear to adversely affect colony strength, and may have reduced mid-summer nosema levels. However, the repeated treatment appeared to have an adverse effect upon queen survivability, leading to an increased rate of colony failure. "

The effects of repeated summer application of oxalic dribble. Available from: https://www.researchgate.net/public...repeated_summer_application_of_oxalic_dribble [accessed Aug 25 2018].

 

[Gilberdyke John]

http://scientificbeekeeping.com/oxalic-dribble-tips/
http://www.dave-cushman.net/bee/oxalicdribble.html

First link - read it all..



This appears definitive?
https://www.researchgate.net/public...repeated_summer_application_of_oxalic_dribble

"Oxalic acid (3.2% w:v) was applied by the dribble method to colonies of honey bees over a warm-season period of 9 consecutive months to evaluate the effect on; 1) varroa infestation, 2) colony strength, and 3) nosema prevalence. Treatment resulted in effective varroa control, did not appear to adversely affect colony strength, and may have reduced mid-summer nosema levels. However, the repeated treatment appeared to have an adverse effect upon queen survivability, leading to an increased rate of colony failure. "

The effects of repeated summer application of oxalic dribble. Available from: https://www.researchgate.net/public...repeated_summer_application_of_oxalic_dribble [accessed Aug 25 2018].

Shame about the "appeared to"
Oh well there'll be another one along soon.

 

[madasafish]

Shame about the "appeared to"
Oh well there'll be another one along soon.

"Beekeeping is the practical application of Biology, Chemistry and Physics, with occasional descent into Chaos"

"Appeared to " covered the "Chaos" bit.

 

[Finman]

I have been directed here, which gives details about the use of Oxybee, a German product that is mixed into a sugary liquid and dosed into the gaps between the frames (seams)in a broodless colony - like our dribble method.


CVB

What is the year of this information?

 

[Finman]

The effects of repeated summer application of oxalic dribble. Available from: https://www.researchgate.net/public...repeated_summer_application_of_oxalic_dribble [accessed Aug 25 2018].

No one has recommended to use dribbling during summer, when brood are present. It hurts brood.

In swarms one treatment is enough. No idea to give more.