From: "Brian Fredericksen" >
> Note: it must be above freezing to use any of the two OA delivery
> methods.

And why would that be in dripping method ?  I have been using dripping 
method for several years and have done it many times in - 2 - - 10 C. Only 
noticed difference is that the person working is getting colder.  I admit 
the efficacy might be a bit less when very cold as the bees then maybe do 
not spread the oxalic so well to each others. But we have not seen 
diffrerence.

Vaporising in cold has been reported by beekeepers here in Finland to give 
less efficacy. Most likely because the cluster is the so tight that the 
oxalic does not get into the bees well enough, or it might turn too fast 
from vapour to solid  because of the low temperature.

Anyone seen any scientific tests about this ?

Ari Seppälä

Finland 

-- Visit www.honeybeeworld.com/bee-l for rules, FAQ and  other info ---