Rhizome Rot of Zingiber officinale Rosc. and Z. mioga Rosc. by Pythium Species

概要

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A rhizome rot and damping off of mioga plant (Zingiber mioga Rosc.) occurred every year in summer in the mioga growing fields in Kyoto. The same disease was observed also on ginger plant (Zingiber officinale Rosc.) in Kyoto and Shiga Prefectures. From these two species of plants was isolated a Pythium species which resembled morphologically P.zingiberum Takahashi. Based on the results of artificial inoculation tests, with or without wounding, this Pythium sp. demonstrated severe pathogenicity on ginger and mioga plants. Meanwhile, isolates of bacteria which accompanied always with Pythium in the diseased tissues showed negative results. Fruits of cucumber, eggplant, tomato, and tubers of potato were found also to be susceptible to this Pythium by artificial inoculation. In the host tissues of ginger and mioga plants, the mycelium of the fungus formed a swelling when in contact with the host cell wall before it penetrated the wall. Optimum temperature of mycelial growth and sexual organ formation of the fungus was 36°-40°C and 20°C, respectively. Studies on certain other morphological and physiological characters of the fungus were also performed.
関西病虫害研究会の論文