This invention provides a strain of *
Pseudomonas aeruginosa* RL76, its bacterial suspension, its preparation method, and its applications, belonging to the field of
agricultural microbiology technology. The *
Pseudomonas aeruginosa* RL76 was deposited at the China General
Microbiological Culture Collection Center (CGMCC) on January 26, 2026, with accession number CGMCC No. 37531. This invention utilizes a mixture of filter mud and soil for
sugar beet cultivation. It was found that, under the same
pathogen inoculation conditions, the filter mud treatment significantly alleviated the occurrence of damping-off
disease in
sugar beets compared to the non-filter mud treatment, suggesting that the filter mud plays a role in increasing the relative abundance of beneficial microorganisms in the soil. Therefore, this invention isolated a strain of *
Pseudomonas aeruginosa* RL76 with highly efficient antagonistic activity against *
Rhizoctonia solani* from the
rhizosphere soil of
sugar beets cultivated using a mixture of filter mud and soil, and for the first time discovered its effective control of
sugar beet damping-off
disease while also promoting
sugar beet growth, representing a groundbreaking achievement.