Yoon, A Postscript to my posting. FWIW, it is my opinion that under FDA requirements and regulations for the treatment of honey bees in the United States only FDA approved pesticides should be administered with specific treatments approved by the FDA for the indicated condition and in only accordance with the required labeling of the product used in the treatment. The State of Oklahoma has not yet approved Api Life Var under Section 18 Emergency Exemption which leaves only Apistan and Checkmite, Section 18 Emergency Exemption, as legal treatments in Oklahoma. Now is not the time to experiment with your bees, now is the time to save your bees. -Chuck :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::