> This is what I would do. I would stay, and use the > trickle method. This has > effect 2 to 3 weeks. Works slower and longer then > the vaporizing method. > Remember worker brood is 12 days closed and drone > brood 16 days. The Varoa > on the bees are killed in 2-7 days. > The oxalic will overlap a important part of the > closed brood, so it will > still kill most of the emerging varoa's. I am not sure I understand. Do you mean there will still be active OA solution in hives after 2 to 3 weeks ? Or would it be because of OA in bees hemolymphe ? May I ask your sources of information ? If OA solution trickling kills most emerging varroa for 2 weeks, I would expect a high % of efficiency even in brood period. Hervé, Laval, Qc, Canada Découvrez le nouveau Yahoo! Mail : 250 Mo d'espace de stockage pour vos mails ! Créez votre Yahoo! Mail sur http://fr.mail.yahoo.com/ :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::