Effect of bio products and bio inoculants against pyricularia grisea the incitant of blast disease in rice

Among the fungal diseases in rice, blast incited by Pyricularia grisea is a major disease. In vitro studies were conducted to control the pathogen by using natural products viz., plant extracts, animal excrements and bio control agents. Among 10 commonly available botanicals, tested for their efficacy against P. grisea by poisoned food technique, the extracts of Azadirachta indica followed by Eucalyptus citrodora and Prosopis julifera were found to successfully inhibit the mycelial growth of the fungus. Sheep urine at 10% concentration, buffalo urine and goat urine at 20 per cent concentration recorded complete inhibition of P. grisea. Among the various bio inoculants P. fluorescens followed by Serratia marcense recorded a growth inhibition of 85.8 & 79.0% respectively.