稻熱病及び稻胡麻葉枯病の潛伏期間竝に發病程度に及ぼす日光の影響に就きて

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1. The writer has made an investigation on the influence of sunlight upon the incubation period and the development of the blast disease as well as the Helminthosporium disease of the rice plant. 2. In the experinments, four groups of the potted rice plants were used. The plants in the first group were exposed to the sunlight both before and after the time of inoculation. In the second group, they were exposed only before the inoculation and shaded with a single sheet of black cotton cloth after their had been taken out from the inoculation chamber until the disease developed. In the third group, they were shaded several days before the inoculation and exposed thereafter to the sunlight. The plants in the fourth group were shaded throughout the experiment. 3. The results of the experiments on the blast disease showed that the mean incubation period shortetaed and the disease increased more or less on the plants shaded before the time of inoculation, without relating to the light condition after inoculation. From the results of the above experiments it seems to be probable that shading in some degrees before inoculation affects the causal fungus advantageously. 4. The mean incubation period shortened more or less on the plants shaded after the time of inoculation without relating to thelight condition before inoculation. However the disease decreased on the plants shaded before the inoculation. These results may indicate that the excessive shading affects the causal fungus disadvantageously. 5. From the results of experiments, the writer recognized the Helminthosporium disease of the rice plant to show almost identical tendencies with those given by the blast disease.
日本植物病理学会の論文
1940-03-30

稻熱病及び稻胡麻葉枯病の潛伏期間竝に發病程度に及ぼす日光の影響に就きて

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