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Local name : Kaandam kullu tegulu
Causal organism: Sclerotium oryzae
The symptoms of Stem rot are:
1. The first symptom appears as small, black irregular lesions on the outer leaf sheath near the waterline.
2. The fungus penetrates the inner leaf sheath resulting the basal portion of the stem to rot.
3. Numerous black, round shining bodies (sclerotia) are formed on the affected sheaths stems, and also in the hollow internodes at maturity.
4. Typical symptoms are apparent in this disease affected area as the crop approaches maturity the plants lose, turn yellow and finally die.
Rice Blast Disease and its Management ( Dr . Krishnaveni)