The total number of live and dead adult mites was checked 24 h after dipping. The number of eggs oviposited by the female mites treated with EOs was counted under a dissecting microscope. These experiments were replicated three times. Using the result of this experiment, five EOs were preselected as more effective than the others. These oils were re-tested for their acaricidal effects using higher concentrations, 0.5% (5 ml/l) and 1% (10 ml/l).