Antifungal activities of cinnamon oil and clove oil at ratio 1:1 and pure against major fungi found on surface of rubberwood (Aspergillus niger, Penicillium chrysogenum, and Penicillium sp.) were investigated using the broth dilution method. The minimum inhibitory concentration (MIC) of the combined cinnamon and clove oils for these test moulds was determined to be 80 µL/mL which were less than or equal to the MIC of the pure oils. Antifungal activity of the combined cinnamon and clove oils at the MIC was further examined on rubberwood. It was found that all moulds on rubberwood were completely inhibited for at least 12 weeks under the storage condition at 30°C and 100%RH.

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