Sheath rot of rice is caused by Sarocladium oryzae that causes damaging effects on the plants. They appear mostly in areas where there is excessive use of nitrogenous fertilizers.
The first symptoms are seen in young leaf sheaths of the uppermost areas. Later the flag leaf sheath appears oblong and irregular with greyish-brown spots. These spots enlarge gradually to form a grey centre and brown margins. The entire leaf will sooner be covered with infections. Further infection causes rotting of panicles and the fungal growth will be visible by a white powdery appearance inside the sheath.
Sheath rot of rice requires both preventive measures and proper application of fungicides. Regular application of the recommended dosage is essential to see the best results.
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