Fecha de publicación: 01/10/2021 Fuente: Wipo Tobacco Agriculture The invention discloses a compound 4, 5-dichloro-2-n-octyl-4-isothiazolin-3-ketone with bactericidal activity, and the structural formula is shown in the specification. The compound can be used as a bactericide for preventing and treating agricultural bacterial and fungal diseases. The bactericidal compound can effectively prevent and treat mango bacterial angular leaf spot, kumquat canker, cucumber bacterial angular leaf spot, wheat scab and tobacco wildfire, and is low in toxicity, green, safe to the ecological environment and free of phytotoxicity. A bactericide prepared from the compound as an active component has the characteristics of good prevention and control effect on the germs, low toxicity, greenness, safety and long lasting period.