We previously reported the adaptability of some prototypes of disinfection machines use high-humidity hot air generated by mixing a superheated steam and hot air for rice seed disinfection. In this study,a new prototype with an improved hourly throughput of seeds was evaluated in terms of its effects on rice blast, “bakanae” disease, and on seed germination. All the three heat treatment conditions using the prototype showed the same disinfective effect against both diseases as hot water treatment, and seed germination was maintained. Furthermore, one of the treatment conditions showed no affects on the growth of 8 breeds of rice seedlings after disinfection.
