Fecha de publicación: 23/07/2021 Fuente: Wipo Tobacco Agriculture The invention discloses a bactericide composition which comprises the following compounds as active components: a compound A: 4-chloro-2-(1,1-dimethylethyl)-5-[[[4-(1, 1-dimethylethyl)phenyl]methyl]thio]-3(2H)-pyridazinone, and a compound B: zineb; and the mass ratio of the compound A to the compound B is (1:10)-(10:1). The composition obtained by compounding the compound A and the compound B has an excellent prevention and treatment effect. Meanwhile, the composition expands the bactericidal spectrum, has a synergistic effect, can improve the disease control effect, enables pathogenic bacteria not to easily generate drug resistance, and can be used for controlling downy mildew, late blight, epidemic disease, damping-off, powdery mildew, rust disease, anthracnose and the like on vegetables such as cucumbers, Chinese cabbages, spinach, hot peppers, tomatoes and the like and crops such as potatoes, grapes, oranges, bananas and the like, and controlling soybean root rot, tobacco black shank and the like.