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Status of brown leaf spot of paddy in cauvery command areas of Mandya District, Karnataka, India

Roving survey was conducted to record the disease severity of brown leaf spot of rice during kharif 2015 in paddy growing Cauvery command areas like Mandya, Srirangapatna, Krishnarajapete, Pandavapura, Maddur and Malavalli. Disease scoring was done by employing SES scale developed by IRRI in 1996.The symptoms in the field were recognized by the greyish brown spots. On leaves, typical spots are brown in color with grey to whitish center, cylindrical to oval in shape resembling sesame seed, usually with yellow halo, while young spots are small, circular and appear as dark brown to purplish brown dots. The results revealed that the disease was prevalent in all the paddy growing areas of Mandya. In 6 taluks of Cauvery command areas surveyed the disease severity, ranged from 7.91 to 16.88 per cent. However highest average disease severity was recorded in Mandya taluk with 16.88 per cent followed by Malavalli taluk with 14.65 per cent. Lowest average disease severity was recorded in Maddur taluk (7.91%) followed by Srirangapatna taluk with 8.02 per cent. Among the villages surveyed average highest per cent disease severity was recorded in Holalu with 21.21 per cent followed by Mallanaya kanakatte with19.77 per cent and Hulikere with 18.10 per cent of Mandyataluk. However lowest average disease severity was recorded in Sannakothannuru and Melukote villages with 4.44 per cent followed by Konanahalli village (5.35 %) of Pandavapurataluk. | Status of brown leaf spot of paddy in cauvery command areas of Mandya District, Karnataka, India