Effect of Nutrient Management and Weeds on Incidence of Fungal Diseases in Rice





brown spot, narrow brown leaf spot, nutrient management, rice, weed management


High-input, modern agriculture uses large amounts of energy, water, fertilizers, and pesticides to produce high crop yields. One of the major bottlenecks of the modern agriculture in the tropics is substantial yield losses due to fungal diseases including rice blast, leaf spots and leaf scald. The aim of this study was to compare the incidence of fungal diseases in judicious nutrient management systems, including organic, integrated, and conventional, under different weed categories during dry season (May to September 2020) and wet season (November 2020 to March 2021). Rice disease incidence were collected for both seasons from 48-84 days after sowing. Additionally, disease incidences on grasses and sedges weeds were also calculated. Brown spot, narrow brown leaf spot, leaf scald, and rice blast incidences were substantial in wet season, while the disease incidences during dry season in 2020 were negligible. The disease incidences were significantly higher (P<0.05) in organic and conventional input systems compared to the integrated input system. Disease incidences of brown spot and leaf scald were found in the dry season. Higher disease incidences were recorded in the wet season than in the dry season. The incidences of the brown spot were higher on sedges than in grasses and vice versa were observed for narrow brown leaf spot disease. Leaf scald incidences were positively correlated with the significant nitrogen status of the rice crop. Disease incidence was low in integrated input system compared to conventional and organic input systems, while weeds were reported as alternative hosts. It can be concluded that the integrated nutrient management with recommended dosage of nitrogen application with proper weed management can lead to low disease incidents, hence is ecologically more sustainable.


Adur-Okello, E.E., AS, L.J., Ekobu, M. and Otim, M.H. (2020). Farmers’ Knowledge and Management of Rice Diseases in Uganda. Journal of Agricultural Sciences 1, 12.
Arnon, D.I. (1949). Copper enzymes in isolated chloroplasts. Polyphenoloxidases in Beto vulgtaris. Plant Physiology 24, 1-15. DOI://doi.org/10.1104/pp.24.1.1
Babu, V.R. (2016). Mineral nutrition for the management of rice diseases. International Journal of Plant Protection 9,306-9. DOI://doi.org/10.15740/HAS/IJPP/9.1/306-309
Bremner, J.M., and Mulvaney, C.S. (1982). Total nitrogen In “Methods of Soil Analysis” pp. 595-624. American Soil Science Society. Wisconsin.
Carvalho, M.P., Rodrigues, F.A., Silveira, P.R., Andrade, C.C., Baroni, J.C., Paye, H.S., and Loureiro, J. E. (2010). Rice resistance to brown spot mediated by nitrogen and potassium. Journal of Phytopathology 158,160-6. https://doi.org/10.1111/j.1439-0434.2009.01593.x
Dassanayake, A.R., De Silva, G.G.R., and Mapa, R.B. (2020). Major soils of the dry zone and their classification In “The Soils of Sri Lanka” pp 49-67. Springer.
Delves-Broughton, J. (2007). “Culture Media for The Isolation And Identification Of Food-borne Pathogens. CRC Press. Boca Raton. Florida.
Department of Agriculture Sri Lanka. “Fertilizer Recommendation”. www.doa.gov.lk [April 1, 2023].
Fortune, S., Hollies, J., and Stockdale, E.A. (2004). Effects of different potassium fertilizers suitable for use in organic farming systems on grass/clover yields and nutrient offtakes and interactions with nitrogen supply. Soil use and management 20,403-9. https://doi.org/10.1111/j.1475-2743.2004.tb00389.x
Godfray, H.C.J., Mason-D’Croz, D., and Robinson, S. (2016). Food system consequences of a fungal disease epidemic in a major crop. Philosophical Transactions of the Royal Society B: Biological Sciences 371(1709), 20150467. https://doi.org/10.1098/rstb.2015.0467
Groth, D.E., Rush, M.C., and Hollier, C.A. (1991). Rice diseases and disorders in Louisiana. Bulletin of Louisiana State University Agricultural Center 828.
Huber, D.M., and Haneklaus, S. (2007). Managing nutrition to control plant disease. Landbauforschung Volkenrode 57,313-322.
International Rice Research Institute (IRRI). (2002). “Standard Evaluation System for Rice”. IRRI. The Philippines.
Jain, A., Sarsaiya, S., Wu, Q., Lu, Y., and Shi, J. (2019). A review of plant leaf fungal diseases and its environment speciation. Biosystems Engineering 10,409-24. https://doi.org/10.1080/21655979.2019.1649520
Julião, E.C., Santana, M.D., Freitas-Lopes, R.D., Vieira, A.D., de Carvalho, J.S., and Lopes, U.P. (2020). Reduction of brown leaf spot and changes in the chlorophyll a content induced by fungicides in cassava plants. European Journal of Plant Pathology 157,433-439. https://doi.org/10.1007/s10658-020-02001-0
Khoury, W. E. I., and Makkouk, K. (2010). Integrated plant disease management in developing countries. Journal of Plant Pathology 92, 35-42. https://doi.org/10.4454/jpp.v92i4sup.340
Koch, R. (1891). “Über Bakteriologische Forschung”. Verlag von August Hirschwald
Marschner, H. (1995). “Mineral Nutrition of Higher Plants”. 2nd ed. pp. 15-22. Academic Press. New York.
McMichael, A.J., Woodruff, NS R.E., Hales, S. (2006). Climate change and human health: present and future risks. The Lancet 367, 859-69. https://doi.org/10.1016/S0140-6736(06)68079-3
Moldenhauer, K.E., and Slaton, N. (2001). Rice growth and development. Rice Production Handbook 192, 7-14.
Perera, P.C.D., and Dahanayake, N. (2015). Review of major abundant weeds of cultivation in Sri Lanka. International Journal of Scientific and Research Publications 5.
Robert, C., Bancal, M.O., and Lannou, C. (2002). Wheat leaf rust uredospore production and carbon and nitrogen export in relation to lesion size and density. Phytopathology 92, 762-768. https://doi.org 10.1094/PHYTO.2002.92.7.762
Sathischandra, S.G., Marambe, B., and Punyawardena, R. (2014). Seasonal changes in temperature and rainfall and its relationship with the incidence of weeds and insect pests in rice (Oryza sativa L) cultivation in Sri Lanka. Climate Change and Environmental Sustainability 2,105-15. https://doi.org 10.5958/2320-642X.2014.00002.7
Seneviratne, S.D., and Jeyanandarajah, P. (2004). Rice diseases-problems and progress. Tropical Agricultural Research and Extension 7,30-48.
Simón, M.R., Cordo, C.A., Perello, A.E., and Struik, P.C. (2003). Influence of nitrogen supply on the susceptibility of wheat to Septoria tritici. Journal of Phytopathology 151, 283-289. https://doi.org/10.1046/j.1439-0434.2003.00720.x
Singh, S.A., Gupta, P.K. (1983). Effect of nitrogen fertilization on the severity of leaf scald of rice caused by Rhynchosporium oryzae. Beiträge zur Tropischen Landwirtschaft und Veterinärmedizin 21,89-93.
Singh, N.K., Yadav, M.K., Yadav, A., Rai, A.B. and Kumar, S., (2021). Alternatives to chemical fungicides for sustainable agriculture In “Plant Fungi and Their Symbiotic Associations” pp. 247-265. Springer. Singapore.
Skamnioti, P. and Gurr, S.J., (2009). Against the grain: safeguarding rice from rice blast disease. Trends in Biotechnology 27,141-150.
Sparks, A., Nelson, A., Castilla, N. (2012). Where rice pests and diseases do the most damage. Rice Today 11,26-27.
Walters, D.R., Bingham, I.J. (2007). Influence of nutrition on disease development caused by fungal pathogens: implications for plant disease control. Annals of Applied Biology 151,307–324. https://doi.org/10.1111/j.1744-7348.2007.00176.x
Zibaee, A. (2013). Rice: importance and future. Journal of Rice Research 1,102. https://doi.org/10.4172/jrr.1000e102




How to Cite

Priyadarshani, T., Wickramasinghe, W., Egodawatta, W., Tharsini, P., Beneragama, D., & Devasinghe, D. (2023). Effect of Nutrient Management and Weeds on Incidence of Fungal Diseases in Rice. Journal of Tropical Crop Science, 10(02), 101–110. https://doi.org/10.29244/jtcs.10.02.101-110