Integration of organic amendments and antagonists for the management of sheath blight in aromatic rice

摘要

The effect of integration of organic amendments with fungal or bacterial antagonists (Trichoderma harzianum and Pseudomonas fluorescens) applied as soil treatment was evaluated against sheath blight disease in Basmati rice caused by Rhizoctonia solaniunder field conditions. Neem cake + T. harzianum was found to be the most effective treatment in reducing the disease incidence by up to 57.27% and disease severity by 54.77% followed by farm yard manure (FYM) + T. harzianum, which resulted in the reduction of disease incidence to 53.77% and disease severity to 52.29%, respectively. Among all the organic amendments, reduction of sheath blight was lowest with sawdust + P. fluorescens with disease incidence of 40.94% and disease severity of 35.29%. Maximum increase in grain yield (39.44%) and 1000-grain weight of rice (29.19g) were recorded with neem cake + T. harzianum treatment followed by treatments FYM + T. harzianum and pressmud + T. harzianum. Minimum increase in grain yield (9.76%) and 1000-grainweight (11.53%) were recorded with the treatment Sawdust + P. fluorescens.