Abstract
Blast disease of paddy caused by Magnaporthe oryzae can be effectively controlled by host plant resistance and fungicide application. We hypothesized that disease moderate resistance (MR) in the host is essential for managing blast disease using fungicides. To test our hypothesis, field experiments with different fungicides were conducted during Kharif 2017 and 2018 using two rice varieties, HR-12 (susceptible) and GNV-10-89 (MR). Initially, both cultivars were evaluated for their reaction against a virulent strain of M. oryzae in a pot experiment wherein GNV-10-89 and HR-12 showed MR and susceptible reactions, respectively. On susceptible cultivar, HR-12, pooled analysis of two-season data revealed that blast disease severity in terms of percent disease index (PDI) among treatments was 70.85–87.83 with grain yield of 34.70-44.15 qha− 1. On the MR cultivar, PDI and grain yield among treatments were 14.78–25.09 and 55.51–65.43 qha− 1, respectively. Our results indicated that none of the fungicides effectively reduce the blast PDI when the cultivar is susceptible to the disease. Whereas, on MR cultivar, many novel fungicides or their combinations, such as Trifloxystrobin 25% WG + Tebuconazole 50% WG at 0.4 gL− 1, Picoxystrobin 22.52% SC at 1.0 gL− 1, Tricyclazole 18% + Mancozeb 62% WP at 1.5 gL− 1 and Tricyclazole 75% WP at 0.6 gL− 1 are effective in reducing the blast PDI. Our study demonstrated that some degree of host plant resistance is essential for managing the disease using fungicides.
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Acknowledgements
Authors are thankful to the Directorate of Research, University of Agricultural Sciences, Raichur, India, for providing financial assistance through the testing chemical project (Ab. Ac. 8096). We are also thankful to the Campus Head and Farm Superindent, Agricultural Research Station, Gangavathi, India, for providing land facilities for conducting field trails.
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Pramesh, D., Chidanandappa, E., Prasanna Kumar, M. et al. Moderate disease resistance in rice cultivars enhances the bio-efficacy of fungicides against blast disease. Indian Phytopathology 76, 141–149 (2023). https://doi.org/10.1007/s42360-022-00582-w
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DOI: https://doi.org/10.1007/s42360-022-00582-w