To obtain a new heat-resistant microorganism comprising heat-resistant Bacillus amyloliquefaciens capable of being proliferated at a specific temperature or higher, capable for producing cultured products enabling to inhibit the generation of plant diseases, and useful for liquid compound fertilizers, etc., from an animal organic fertilizer.

Heat-resistant Bacillus amyloliquefaciens (FERM P-15796) capable of being proliferated at temperatures of ≥50°C. The microorganism can produce cultured products capable of inhibiting the generation of plant diseases. The cultured products can be used as liquid compound fertilizers, leaf surface- applying liquids, etc., to inhibit the generation of the plant diseases caused by microorganisms such as Fusarium, Rhizoctonia, Pythium or Verticillium and healthily grow the plants. The heat-resistant microorganisms are obtained by gathering a fermenting animal organic fertilizer having a fermentation temperature of 70°C, suitably diluting the organic fertilizer with sterilized water, culturing microorganisms contained in the diluted fertilizer at 50-60°C by a plate dilution method, screening the culture product and subsequently collecting the produced colony.