The present invention relates to an antibacterial or plant disease controlling composition containing caryolan-1-ol. According to the present invention, the caryolan-1-ol, as a volatile substance isolated from a Streptomyces sp. strain, has an excellent antibacterial effect on various plant pathogens including Botrytis cinerea, Fusarium oxysporum, Phytophthora nicotianae, Colletotrichum gloeosporioides, Rhizoctonia cerealis, Rhizoctonia solani and Gibberella morniformis and the like, and has storage disease preventive and herbicidal activity, thereby being usable as an antibacterial composition and a plant disease controlling composition.
