Checked varroa drops 4 days after vaping hives & Nucs with Api-Bioxal. 7 hives with 0 drop, 3 hives with 1 mite, 1 with 3 mites and 1 with 5 mites. Guess shows how effective Apivar / Apitraz strips are after 10 weeks of treatment from end Aug. Slightly surprised at the very low drop non-the-less.