Steam distilled volatile oil from marjoram ( Origanum majorana L.) was evaluated for its antibacterial and antifungal activities. A range of 25 bacterial and five fungal species was used in this study, and included animal and plant pathogens, food poisoning bacteria and mycotoxigenic fungi. The oil exerted considerable inhibitory powers against several of the bacteria, with the food‐poisoning bacterium Staphylococcus aureus being least affected. The most susceptible organisms were Beneckea natriegens, Erwinia carotovora and Moraxella sp. Of the fungi tested, Aspergillus niger proved the most susceptible to marjoram oil.
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Deans et al. (1990) studied this question.
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