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1. The fungus attacks the crop from seedling in nursery to milk stage in main field. Symptoms appear as lesions (spots) on the coleoptile, leaf blade, leaf sheath, and glume, being most prominent on the leaf blade and glumes.
2. The disease appears first as minute brown dots, later becoming cylindrical or oval to circular The several spots coalesce and the leaf dries up.
3. The seedlings die and affected nurseries can be often recognised from a distance by their brownish scorched appearance.
4. Dark brown or black spots also appear on glumes which contain large number of conidiophores and conidia of the fungus. It causes failure of seed germination, seedling mortality and reduces the grain quality and weight.