Developed and provided are a safe, non-damaging microbial pesticide having a high controlling effect against soil-borne diseases caused by phytopathogenic filamentous fungi that imposes little burden on the environment, and a method for effectively controlling soil-borne disease using this microbial pesticide. Provided is a soil-borne disease control agent against phytopathogenic filamentous fungi containing photosynthetic bacteria and bacteria of the genus Bacillus as active ingredients. Also provided is a method for controlling soil-borne disease by applying this control agent to the soil or the like.
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