Plant Extracts, BAU-Biofungicide and Fungicides in Controlling Some Important Diseases of Rice cv. BRRI Dhan40

Cercospora oryzae, Rhizoctonia solani, Sarocladium oryzae and Ustilaginoidea virens are main causal pathogen of four rice diseases viz; narrow brown leaf spot, sheath blight, sheath rot and false smut, respectively. An experiment was conducted to evaluate the extracts of garlic (Allium sativum L.) and neem (Azadirachta indica L.), BAU-Biofungicide (Trichoderma based preparation), Bavistin DF (Carbendazim) and Potent 250 EC (Propiconazole) under laboratory and field conditions for management of diseases of rice cv BRRI dhan40 during Aman season of 2011 and 2012. Significant reduction in mycelial growth of Cercospora oryzae, Rhizoctonia solani, Sarocladium oryzae and Ustilaginoidea virens were observed with BAU-Biofungicide (2 and 3%) in laboratory as well as reduced disease severity of narrow brown leaf spot, sheath blight, sheath rot and false smut in the field which is close to the effect of Propiconazole (0.1%). Carbendazim (0.1%) also showed significantly low severity of narrow brown leaf spot, sheath blight and sheath rot disease in the field and mycelial growth inhibition of Cercospora oryzae, Rhizoctonia solani and Sarocladium oryzae was recorded in-vitro test. Highest grain yield 6.07 t ha-1 was found in Propiconazole 250 EC (0.1%), whilst BAU-Biofungicide (3%) resulted 5.89 t ha-1yield. Most of the seed borne pathogens of harvested seeds were controlled by BAU-Biofungicide and Propiconazole when they were applied as foliar spray.