Abstract
In the present paper the authors dealt with the results of experiments on the varietal differences in the susceptibility of rice plants using 1004 varieties. The susceptibility to the present disease was expressed by calculating from the formulas (table I and 2) based on the number of spots and their area per a unit area of leaf. The results were also compared with those obtained from the ordinary method by measuring only tlle nuniber of spots per a unit length of leaf. These two results did not completely coincide. The most resistant and susceptible varieties are as follows : resistant : rice plants from Hainan Island ; No. 217 ; Chiu Tzu Chiu, susceptible : Sakigak:e No.126 ; Kairyo Mochi No.1; Bozu No. 6 ; Naka No. 3.
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