By feeding a recipe tea tree essential oil to bees to kill deadly mites, we are giving bees a fighting chance to survive. In recent years a number of beekeepers have turned to essential oils to control the ravages of Colony Collapse Disorder (CCD). Varroa mites are literally killing whole bee hive colonies. The anti-fungal and antibiotic properties of tea tree essential oil can either kill, or adversely affect the reproduction cycle of varroa mites.