Comamonas aquatica strain, biocontrol microbial inoculum, and preparation method and application of biocontrol microbial inoculum

The invention relates to a comamonas aquatica strain, which is named as comamonas aquatica Ca30, the preservation date is November 9, 2020, and the preservation number is CGMCC NO.21152. The comamonas aquatica Ca30 is simple in production process, short in culture time and low in cost, and the strain can be prepared into a biocontrol microbial inoculum for preventing and treating rice sheath blight disease through a simple, rapid and low-cost preparation method, and experiments prove that after rice leaves are treated by the biocontrol fungicide under an in-vitro condition, the disease area of rice sheath blight disease is reduced by 94.57%, the control effect on the rice sheath blight disease under a greenhouse condition reaches 65.26%, the control effect of the biocontrol fungicide is equal to that of a common chemical pesticide thifluzen.difenomethyl, and the antibacterial effect of the biocontrol fungicide is very obvious. 本发明涉及一种水丛毛单胞菌菌株，命名为水丛毛单胞菌Ca30，保藏日期为2020年11月9日，保藏编号：CGMCC NO.21152；本发明的水丛毛单胞菌Ca30，生产