Well, I must say it worked very well because I have a lot of dead varroa in my trays of oil. I can only do the dribble treatment once, so hopefully it knocked down enough to make it through the honey flow coming up and then I can sugar dust them again.
I have a question - how do you count the mites? Do you count 1/4 of the tray and multiply by 4? It would be very tedious to count the whole tray. I would like to get a count and put the trays back to see if more drop off.