Abstract— The in-vitro test of selected fungicides against brown spot disease incidence of rice and development of a disease prediction model base on weather variable was conducted during two Kharif seasons from 2014-2015 to 2015-2016. Results revealed that among the selected fungicides treatment lowest per cent disease incidence was found in Propiconazole in both the cropping season (2014-15) and (2015-16) with minimum mean per cent disease index (PDI) value bcd (7.76) and (7.03) with per cent disease control of 72.39 and 73.09 respectively over the control, followed by Propineb (PDI) value bcd (8.6) and (7.23) with per cent disease control of (69.40) and 73.09 respectively of the two cropping seasons. Among the fungicides treatment highest disease incidence was found in Thiophanate with maximum mean per cent disease index (PDI) value bcd (17.03) and (14.98) with per cent disease that control of 39.41 and 42.67 respectively in both the cropping seasons. It was also found disease intensity was higher during the first cropping season (2014-15) as indicated by higher mean per cent disease index (PDI) value abcd (12.5**) whereas in the following cropping season (2015-16) with lower value of (PDI) value abcd (11.18**).
Keywords— Brown spot, Helminthosporium oryzae, disease index, Fungicides, Rice, Fungal Diseases.
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