Phytophthora fragariae によるイチゴ根腐病に関する研究 : 第1報病原菌の同定

概要

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Strawberry root rot was first recorded in a small area in the suburbs of Shizuoka city in 1949, where strawberries are usually grown on paddy fields after rice plants have been harvested and the flooding water has been drained off. Since then this disease has spread in the strawberry growing areas in Shizuoka Prefecture. the symptoms were always accompanied by red stele which is characteristic to the Phytophthora infection. When the roots showing the red slele symptom were immersed in water, the pear-shaped sporangia characterisitc to Phytophthora appeared abundantly on the root surface. The root rot disease of strawberry occurring in Osaka and Hyogo Prefectures was also accompanied by the red stele symptom. bundant sporangia of Phytophthora were always detected from these deseased roots .The results indicate that the root rot disease is identical with that ocurring in Shizuoka Prefecture. Phytophthora sp., Fusarium oxysporum, Phthium spp., Rhizoctonia sp., and other unidentified fungi were isolated from the diseased roots. Inoculation experiments showed that only Phytophthora sp. was responsible for the unique red stele symptom. The Phytophthora sp. was identified as Phytophthora fragariae Hickman from the physiological and morphological characteristics.
日本植物病理学会の論文
1965-12-25