The mineral oil and bees wax concoction I posted on the Bee-L this
summer seemed to control the varroa mites during the honey flow.  I
noticed a significant reduction in mites when I opened up the drone
cells.  There were still some mites but not like before I began the
treatments.  I went from five to eight varroa in most drone cells down
to one or two every third or fourth drone cell.