Alongside the discussion about fogging oxalic acid, I'd like to bring to
your attention what follows.
Here in our country, there is a guy who evaporates oxalic acid (no
sublimation). He uses 16.5 grams of oxalic acid per liter of water (half of
the quantity used by dripping or evaporating). He argues as follows:
- 1 centiliter of water gives 10 liter of water vapor;
- A hive has a capacity of 40 liters but is half filled with bees, frames
and food. So he needs 20 liters of water vapor to fill the hive.
- For this 20 liter of vapor, he needs 2 centiliter of water. In this 2
centiliter of water there is 0.33 gram of oxalic acid. This volume increases
1000 times upon evaporation. So the bees are confronted with an oxalic acid
concentration that is 2000 times smaller than when dropping/evaporating. 
- The treatment is done for all colonies 3 times a year for 16 days, every 3
days (ie 6x - Based on the 4 foretic days of the mites): end of February,
mid July and in Oktober/November.
- A colony without bread: one evaporation/year.
- He makes water vapor with a converted coffee set.
- He is very satisfied with the result.
As for safety, at the right dose, no fumes escape from the hive.


Kind regards,

Ghislain De Roeck,
Belgium

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