PROBLEM TO BE SOLVED: To provide a bacteria population, a plant disease control agent, and a method of controlling a plant disease which can be used for controlling plant disease.SOLUTION: The present invention provides a bacteria population separated from organic material and cultured in an oligotrophic culture medium.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2020,JPO&INPIT【課題】植物病害の防除に使用される細菌集団、植物病害防除剤、及び植物病害の防除方法を提供する。【解決手段】有機資材から分離し貧栄養培地にて培養した細菌集団。【選択図】図3