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Rice Sheath Blight

Rice Sheath Blight

Rhizoctonia solani

fungi

In a Nutshell

    Oval, green to grey water-soaked lesions on stalks (sheaths) near the water lineIrregular grey to white lesions with brown margins appear on leaves and stalks

Hosts: %1$s

· Rice

Symptoms

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.

Trigger

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.

Biological Control

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.

Chemical Control

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.

Preventive Measures

    Ensure balanced fertilizationAvoid excessive nitrogen fertilizationControl host weedsEnsure good drainageKeep sufficient space between plantsAvoid early planting