Rice Sheath Blight
Initial symptoms of the disease are lesions on stalks (sheaths) near the water line. These lesions are oval, greenish-grey, 1-3 cm long and water-soaked. These lesions grow irregularly and turn grey to white with brown margins. As the disease progresses, the upper parts of the plant are infected. On these parts, rapidly growing lesions appear and the whole leaf brightens. This can result in the death of the leaf and the whole plant. Furthermore, fungal pustules form on the plant surface.
Optimal conditions for Rice Sheath Blight are high temperatures between 28 and 32°C, high levels of nitrogen fertilizer and a high relative humidity of 85-100%. Especially during rainy season, the risk of infection and spreading of the disease is high. Close canopy is favoring humid conditions and contact. The fungus survives in the soil for several years as a sclerotium. It floats to the surface when sites are flooded. Once in contact with a rice plant, the fungus enters the leaf sheath.
Sorry, we don't know of any alternative treatment against Rhizoctonia solani . Please get in touch with us in case you know of something that might help to fight this disease. Looking forward hearing from you.
To prevent an infection, Carbendazim 500 g/ha can be sprayed. Fungicides containing Strobilurin Propiconazole, Propiconazole + Strobilurin or Xemium can be used to control the disease.