1.The rice nematode disease will not decrease in the percentages of the culms with white-tip leaves even though the affected seeds are sown directly in the paddy field. 2.Possibilities are shown to prevent the infection of the causal nematode by the method in which the seed-time is hasten about 60 days than the usual (May 25 to June 5 in Kyushu ). 3.Both the modified hot water treatment-affected seed is immersed in hot water at 50°to 52℃. For 5 to 10 minutes after being soaked in cold water below 20℃.for 16 to 20 hours ? and the hot water method written below are found not able to destroy the pathogens of the important diseases of rice, hibernating in the husks. 4.Anew hot water method for the prevention of the rice nematode disease is deviced, in Which the dry seed is immersed directly in hot water at 56° to 57℃.for 10 to 15 minutes. Retardation of germination is observed only when dry seed is immersed in hot water at 60℃. for more than 20 minutes. 5.The new hot water treatment is possible to be applied in practice at the season 60 days before the seed-time.
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