Hi, I claim almost 100% control of both tracheal and varroa mites by placing one Trebor Extra Strong Mint on top every other brood frame. I assume that the effect is due to the high level of menthol contained in Trebor Extra Strong Mints. Also, I have found a very rapid knockdown of varroa mites by adding 3 Eucalyptus 'Tunes' to my smoker. On the packet of these very effective throat pastilles I note that the ingredients include Eucalyptus, Menthol, Camphor and HONEY!. I am in the habit of smoking myself before working my bees and since adding 'Tunes' to my smoker I have been completely free of both headlice and influenza. Food for thought? Gus Truscott