Management of Brown Spot Disease of Rice and Studies of Growth Rate of Disease on Application of Different Synthetic Fungicides by using Different Statistical Tools

Abstract The in-vivo test of selected fungicides against brown spot disease of rice and studies on growth rate of disease incidence by using different statistical tools was carried out during the crop seasons, kharif (2014-15) and (2015-16). The pool mean results data of two crop seasons revealed that among the synthetic fungicides evaluated against per cent disease incidence, minimum disease index (PDI) was found in Propiconazole (7.39) with maximum disease reduction of 72.75% over the untreated control followed by Propineb (7.91) and Myclobutanil (8.84) with per cent disease reduction of 70.83 and 67.40 respectively over the control. Among the fungicides treatment maximum disease incidence was observed in Thiophanate (16) followed by Carbendazim (10.96) with per cent disease reduction of 41 and 59.58 over untreated control. The studies on rate of growth of disease severity by using linear and non linear parameters among the synthetic fungicides found that lowest average growth rate during the first crop seasons (2014-15) was observed in Propiconazole (0.124) at 10 days intervals of disease progression analysis studies. Similarly in the following crop season (2015-16) also lowest average growth rate of untransformed and transformed model was observed in Propiconazole (0.069). The analysis thus obviously confirmed that among the different synthetic fungicides tested, Propiconazole was the most effective and most promising fungicides in managing the brown spot disease incidence of rice.

Keywords— Brown spot disease, rice, synthetic fungicides, minimum disease index.

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Agriculture Journal: Management of Brown Spot Disease of Rice and Studies of Growth Rate of Disease on Application of Different Synthetic Fungicides by using Different Statistical Tools

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