レタスに腐敗を起こす病原細菌の種類と作型との関係

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The present study was conducted to clarify the relationship between the cropping types and the kinds of bacteria causing head rot of lettuce. One hundred and thirty nine head rot samples were collected from 52 main lettuce growing areas in Japan, from which 214 isolates of pathogenic bacteria were obtained. The majority of them were identified as Psudomonas cichorii (Swingle) Stapp, P. marginalis (Brown) Stevens, P. viridiflava (Burkholder) Dowson, Xanthomonas vitians (Brown) Dowson and Erwinia carotovora (Jones) Holland. P. cichorii was prevalent in the spring-cropping type in northern Japan, the summer-cropping type in the high lands in central Japan and the autumn-cropping type in the ordinary areas, but seldom occurred in the winter-cropping type in central or south-western Japan. P. marginalis and P. viridiflava were prevalent in the autumn- and the winter-cropping types grown under plastic tunnels. They seldom or never occurred in the spring- and/or in the summer-cropping types. Head rot due to these two species of bacteria seemed to be induced by physical injuries like frost, and accelerated by high humidity in plastic tunnels. X. vitians occurred in all the cropping types except spring-cropping type, and its occurrence seemed to be related to the localities rather than the cropping types. E. carotovora was also main causal bacterium together with P. cichorii in the spring-cropping type, but it decreased in the autumn- and winter-cropping types. These results suggest that the kinds of bacteria causing head rot of lettuce are closely related to the climatic conditions except X. vitians, especially to the temperature during the cultivation of lettuce.
日本植物病理学会の論文
1979-07-25

レタスに腐敗を起こす病原細菌の種類と作型との関係

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