Possible action mechanisms by which mycelial growth may be reduced or totally inhibited have been proposed. Thus, Lucini, Zunino, López, and Zygadlo (2006) indicated that mycelial growth inhibition is caused by the monoterpenes present in essential oils. These components could increase the concentration of lipidic peroxides such as hydroxyl, alkoxyl and alkoperoxyl radicals and so bring about cell death. For Sharma and Tripathi (2006), the EOs would act on the hyphae of the mycelium, provoking exit of components from the cytoplasm, the loss of rigidity and integrity of the hypha cell wall, resulting in its collapse and death of the mycelium.