Studies on epidemiology of grain discolouration disease of paddy

Grain discoloration complex disease of rice is an emerging threat to rice crop all over the world and it acquires particular importance as it results in qualitative loss of harvested crop. So the present study was carried out to know the epidemiology of grain discolouration disease. Disease development in relation to weather parameters were studied like maximum and minimum temperature, morning and evening relative humidity, rainy day and rainfall with the development of the grain discolouration in paddy. The severity recorded at different stages of crop growth was correlated with weather parameters during the respective stage. The severity of paddy grain discolouration during kharif 2017 correlated positively with maximum temperature (r=0.73) and minimum relative humidity (r=0.29).