Spectral characteristics curves of rice plants infected by blast

Blast is one of the most dangerous disease of rice plants. The changes at the early stages of the spectral reflectance curves for rice plants affected with blast disease reveal a decrease in green and near-infrared bands. A continuous decrease in the red and near infrared wavelength are illustrated at maturity stage. At later maturity stages the change in spectral reflectance is accompanied by a continuous shift of visual peak green and red bands to form a straight line in the near-infrared. The correlation coefficient of the spectral signature values of LANDSAT MSS bands and the RVI and NDVI of infected rice plant are obvious.<>