Abstract
A remote sensing of leaf temperature of rice blast disease was made using an infrared radiative thermometer. The severity of rice blast disease of Hiyokumochi (sensitivity cultivar) was not confirmed by photographs of the visible range taken 19 days after eclosion. The leaf temperature of Hiyokumochi was 1.1°C higher than Reiho (resistant cultivar) using an infrared radiativethermometer. Thus, the severity of rice blast disease of Hiyokumochi was confirmed by infrared thermal image. The leaf temperature difference and disease severity were proportional. The disease severity of rice blast disease (%) = 10.56X2+0.582X-0.295(r=0.999***). Where X was the difference of leaf temperature.
