Plant pesticide for preventing mildew of tobacco leaves and use method of plant pesticide

The plant pesticide for preventing the mildew of the tobacco leaves comprises perilla essential oil and alcohol or acetic acid or carbonic acid. The method comprises the following steps: spraying a perilla frutescens essential oil solution on the surface of a basal disc; the purple perilla essential oil solution consists of purple perilla essential oil, alcohol and water, or consists of purple perilla essential oil, acetic acid and water, or consists of purple perilla essential oil, carbonic acid and water. The bactericidal composition has the advantages that the bactericidal composition can completely replace chemical pesticides such as carbendazim, chlorothalonil, manganese zinc formate, azoxystrobin, flusilazole, difenoconazole, propiconazole, iprodione and prochloraz, and can be used for effectively killing, preventing and treating mould during tobacco seedling raising, conditioning and storage, so that the loss is reduced. 一种用于烟叶防霉菌的植物农药包括紫苏精油、酒精或乙酸或碳酸。一种烟叶育苗防霉菌的方法包括将紫苏精油溶液在基盘表面进行喷雾；所述的紫苏精油溶液由紫苏精油、酒精、水组成