> But, I only have 90%, not 65%, which is what they use. Here you will find some interesting Swiss considerations about the application of formic acid (85% - 65%): http://www.agroscope.admin.ch/imkerei/00316/00329/02079/index.html?lang=en Best regards, Ghislain De Roeck Belgium. *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm