Rice root rot

The disease is caused by the fungus Falciphora oryzae, a soil-borne pathogen known for causing root necrosis in rice plants. This fungus disrupts the root system, preventing the effective uptake of nutrients and water, which ultimately leads to a decline in plant health and overall vigor.

Rice (Oryza sativa) is the primary crop impacted by this fungal infection. The pathogen targets young seedlings and plants in the tillering stage, making these phases critical for monitoring and disease detection. The spread of the fungus often correlates with contaminated fields or infected seeds.

Typical symptoms of infection include stunted growth, chlorosis, and general wilting of the leaves. Upon inspecting the roots, farmers will observe visible lesions, tissue browning, and root system decay. In high humidity, the pathogen may produce white or grayish mycelial growth on the base of the infected stalks.

The development of the fungus is accelerated by unfavorable environmental conditions such as poor soil aeration, waterlogging, and temperature fluctuations. Falciphora oryzae is highly persistent in the field, as it can remain dormant in crop debris or the soil matrix for several seasons, awaiting suitable conditions to re-emerge.

The economic impact is manifested in reduced stand density and significant yield loss. Management and prevention strategies involve

• Implementing crop rotation cycles
• Using high-quality, fungicide-treated seeds
• Improving soil drainage and irrigation management
• Applying targeted fungicidal applications when infection thresholds are reached