essential oils confer antimicrobial activity by damaging the cell wall and membrane, leading to cell lysis, leakage of cell contents, and inhibition of proton motive force (4). In addition, there is evidence that they effectively kill bacteria without promoting the acquisition of resistance (1, 22). Finally, many essential oils are relatively easy to obtain, have low mammalian toxicity, and degrade quickly in water and soil, making them relatively environmentally friendly (11).