In a message dated 16/03/2007 23:46:42 GMT Standard Time, [log in to unmask] writes: How many have misused OA? I have heard of a few who doubled the amount of OA in solution or treated 2-3 times during brood season. A lecture at Apimondia in Dublic 2005 described how the concentration of the sugar syrup is more important than the amount of oxalic. A stronger solution with (from memory) 3.2% oxalic was more effective than a weaker one with 4.5%. If anybody is interested I could check the figures to confirm. Chris ****************************************************** * Full guidelines for BEE-L posting are at: * * http://www.honeybeeworld.com/bee-l/guidelines.htm * ******************************************************