キュウリ斑点細菌病の発生および病原細菌の伝搬に及ぼす降雨の影響

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Effect of rainfall on the development of angular leaf spot of cucumber was investigated in an experimental field equipped with artificial rainfall facilities. Daily artificial rainfall for 30 minutes resulted in severe development of angular leat spot, and the percentage of infected leaves showed twice as much as that of cucumber grown in check plots, although the humidities of both rainfall and check plots were maintained in almost similar conditions during the experimental period. The rain water dripping from the diseased leaves contained the pathogen in concentration of 10^5-10^6 cells per ml of raindrop during 5-l0 minutes after the beginning of the artificial rainfall. Typical symptoms of the disease also appeared on seedlings, when those were exposed to the dripping rain water from the diseased leaves for 3 minutes and kept in moist chamber for 2 days. From the results mentioned above, it was supposed that the facilitative effect of rainfall on the progress and development of angular leaf spot was principally due to the transmission of causal bacteria with raindrops. In order to control the disease by means of culturing method, cucumber vines grown in field were sheltered by roof of plastic film. As the result, development of the disease was reduced to such a light degree of disease showing only marginal small lesions on leaves as seen in Fig. 2. So, we concluded that cultivation of cucumber avoiding rain under plastic roof was very effective on the control of angular leaf spot.
日本植物病理学会の論文
1981-07-25

キュウリ斑点細菌病の発生および病原細菌の伝搬に及ぼす降雨の影響

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