Comprehensive Review of Major Rice Diseases: Causal Agents, Symptomatology, and Integrated Management Strategies

Rice (Oryza sativa L.) is the staple food for more than 3.5 billion people worldwide, with annual global production exceeding 800 million tonnes. However, diseases remain a major constraint, causing average yield losses of 10–30%, and in severe outbreaks, such as rice blast epidemics in Asia, up to 50% loss has been recorded. Bacterial blight alone can result in 20–30% yield reductions, while sheath blight accounts for 15–25% under conducive conditions. This review provides a comprehensive overview of major rice diseases, focusing on their causal organisms, diagnostic symptoms, and modes of transmission. Recent advances in management are highlighted, including the deployment of over 100 resistant varieties, identification of more than 80 resistance genes and QTLs through molecular breeding, and transgenic approaches that have reduced disease severity by up to 40–60% in field evaluations. Cultural controls, such as crop rotation and optimized planting density, continue to play an essential role in integrated disease management. By compiling updated quantitative insights into disease impacts and control methods, this review aims to support researchers and farmers in early detection and effective management, thereby contributing to sustainable rice production.