ジャガイモの黒脚病

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Around 1955, a bacterial disease of potato plant, distinguished from soft rot caused by E. carotovora, was found at Nakashibetsu Cho in Nemuro Area of Hokkaido. Since then, it has gradually spread through Kushiro and Abashiri Areas. In 1970, the outbreak of this disease was observed in several parts of Tokachi and Kamikawa Areas in Hokkaido. The symptom of this disease was simillar to blackleg disease as reported in other countries. The causal organism quickly decayed vegetables, showing typical soft rot appearance. They produced the same symptom as those of naturally infected potato plants, when inoculated in the potato stems at the soil line. Intensity of the symptom at l8C was higher than that at 24.5C. When healthy seed tubers were inoculated with the causal organism by corkborer, many of the plants that grew from those seed tubers showed blackleg symptom. Also, E. chrysanthemi produced the blackleg symptom when inoculated by the same method. The bacterial and serological characteristics of the causal organism agreeded with the descriptions of E. atroseptica, reported by Graham et at. It had been recognized that Logan's medium was useful for differentiation of the causal organism from E. carotovora or E. chrysanthemi. Agar gel diffusion patterns showed that the causal organism possessed species-specific antigen, which did not react with E. carotovora and exsisted in almost all isolates, as well as common antigen with E. carotovora (Including aroideae strain). But E. chrysanthemi did not possess any common antigen with the causal organism or E. carotovora. From these results, we identified the causal organism with Erwinia atroseptica (van Hall) Jennison according to Bergey's system. According to Dye, the scientific name E. carotovora var. atroseptica (van Hall) Dye is suggested for this bacterium. However we ,ire inclined to retain, for the time being, E. atroseptica as the species name.
日本植物病理学会の論文
1973-09-30

ジャガイモの黒脚病

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