Abstract
In order to testing the varietal resistance of the paddy-rice to the bacterial leaf-blights, 142 varieties contained the inlanided typical varieties were examined during three years from 1950 in the ever-occurring areas of those disease. The upper three leaves in each variety were researched and its bacterial resistance was resumed. In result, all examinated varieties took bacterial leaf-blight and the complete resistant varieties were not iound and a slight difference of resistance appeared in the varieties testod in the early stage which become evidently by and by in the progress of growth. When water was poured over the plant's head to be took bacterial leaf-blight in the seedling stage on the bed, the treatment was not effectively, sothat the degree of bacterial leaf-blights in the ever-occurring areas may be resulted by storm in autumn. It is very difficult make to get ill similarily in these areas in the test, it seems a good idea to directly confounded the degree of bacterial resistance in every variety. The strong 8 varieties, sub-strong 12 ones, sub-weak ll ones and weakest 7 ones were found in this experiment. A Iarge number of varieties were examined, but: the superior resistant varieties were very few, therefore it is important to breed the superior resistant varieties.
