Bacillus compound inoculant with function of preventing and treating powdery mildew and alternaria alternata as well as preparation method and application of bacillus compound inoculant

The embodiment of the invention provides a bacillus compound inoculant with a function of preventing and treating powdery mildew and alternaria alternata as well as a preparation method and application of the bacillus compound inoculant. The invention relates to the technical field of microorganisms, in particular to a compound microbial inoculant which is prepared from bacillus strains carefullyselected by an inventor according to a specific proportion, can be directly used as a fungus bactericide, and can also be added with nutrients and auxiliaries to be prepared into a foliar fertilizer product with a disease prevention function for use. The invention has a good prevention and control effect on powdery mildew and alternaria alternata, can become endophyte of plants, has a prevention and control effect for a long time, saves the cost and improves the economic benefit. Moreover, the preparation method of the bacillus compound inoculant is simple and convenient, can be used for large-scale production, and is