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Symptoms of Sheath Rot
1. Symptoms usually develop as lesions on sheaths of lower leaves near the water line when plants are in the late tillering or early internode elongation stage of growth (approximately 10 – 15 days after flooding).
2. These lesions usually develop just below the leaf collar as oval-to-elliptical, green-gray, water-soaked spots about ¼ inch wide and ½ to 1¼ inch long.
3. Disease development progresses very rapidly in the early heading and grain filling growth stages during periods of frequent rainfall and overcast skies.
4. As plants senesce from maturity, lesions will dry and become grayish-white to tan with brownish borders.
5. Sclerotia, initially white but turning dark brown at maturity, are produced superficially on or near the lesions.
ADVANCES IN INTEGRATED RICE DISEASE MANAGEMENT ( Dr. Krishnaveni )