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During the past four years, a fungus causing rhizome rot of ginger has been isolated from soils and plants of both protected and outdoor ginger-growing areas throughout the cultivation season.The fungus could be consistently isolated from various parts of rotten ginger, especially from the basal part of terrestrial stem and rhizomes regardless of stages of disease development and locations. The fungus was isolated not only from soils in which ginger is being grown, but in places where ginger has previously grown. The fungus was isolated with high frequency from the lots devoted to intensive ginger cultivation through the years.The main morphological characteristics of the isolated fungus were identical with those of Pythium zingiberum Takahashi.

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