Just in case you guys haven't been reading my recent exploits as posted in other forums, I've inspected lots of drone brood over the past couple of days (cells broken apart during manipulation) and have found not one varroa on any of the larvae! I use FGMO only (no thymol) every five days in concert with sbbs and slatteld racks (I see a big difference since adding the slatted racks). This is my third year in beekeeping and my colonies are stronger than ever. I credit this all to Dr. Rodriguez' work. As a result of FGMO, I have very hygienic, gentle bees and chemical free hives. An important point to an organic gardener. Thanks, Doctor!