A method for control of gray mold caused by Botrytis cinerea is provided to inhibit growth of Botrytis cinerea without specific equipments and technique by treating a plant with a single frequency sound, so that the gray mold is suppressed in an environment-friendly manner. The gray mold caused by Botrytis cinerea is controlled by treating a subject plant with a single frequency sound selected from 250-500 Hz generated by a sound generator, wherein the plant is vegetable including tomato, cucumber, strawberry, lettuce, eggplant and red pepper, or flower including lily, gladiolus, rose and carnation.
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