Temporal progress of sheath blight and yield of herbicide-resistant irrigated rice genotypes in Southern Tocantins, Brazil
DOI:
https://doi.org/10.55627/zoobotanica.003.03.1676Keywords:
Sheath blight, Oryza sativa, fungicides, weeds, clearfield ® technologyAbstract
Rice (Oryza sativa L.) is a staple crop of global importance, but its productivity is often constrained by diseases and weeds, which lead to significant reductions in rice yield and quality. The technology of Clearfield enables the effective use of imidazolinone herbicides in rice with a resistant genotype. Nonetheless, besides the presence of weeds, diseases like the sheath blight, which is caused by the Rhizoctonia solani, are another limitation to irrigated rice farming. Clearfield genotypes have not been extensively studied for their resistance to sheath blight, and this disease has been on the rise in recent years, especially in the State of Tocantins, Brazil. The objective of this study was to determine the resistance of herbicide-resistant genotypes of irrigated rice to sheath blight at floodplain conditions in southern Tocantins. This was tested in 2019/20 and 2020/21 with a randomized block design (4 replications) in naturally infested commercial fields where sheath blight has previously occurred. The treatments consisted of advanced breeding lines and commercial cultivars. The temporal dynamics of sheath blight in the two years were best represented by the monomolecular model. Genotypes AB191132-RH and AB191122-RH exhibited the lowest disease severity and area under the disease progress curve (AUDPC) values without compromising yield, indicating partial resistance to sheath blight. Disease severity and yield loss were also minimized by the preventive use of fungicides. These results indicate that resistant Clearfield(r) rice genotypes and fungicide management are promising methods of sheath blight control in irrigated rice systems as integrated approaches
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Copyright (c) 2025 David Ingsson Oliveira Andrade de Farias, Anila Kanwal, Muhammad Bilal, Muhammad Rizwan, Dalmarcia de Souza C. Mourão, Luis O. Viteri, Manuel A. Gonzales, Paulo R. S. Fernandes, Osmany Manuel Herrera Armijos, Vitória B. Silva, Ildon R. do Nascimento, Cristiano B. de Moraes, Vânia Thais S. Gomes, Marcos G. da Silva, Gil R. dos Santos
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