Abstract
Sheath blight caused by Rhizoctonia solani is a major rice disease worldwide and causes serious yield losses. To identify quantitative differences in disease development, four inoculum sources, viz. typha bit, maize-sand meal medium, rice grain-rice hull and tooth pick were evaluated against twelve rice genotypes using artificial inoculation conditions for 2 years. Relative lesion height (RLH) was measured at 7, 14 and 21 days after inoculation. Disease incidence was recorded at 21 days post inoculation. Inoculum sources significantly affected disease development. Typha bit inoculation showed the highest RLH (55.1%) as well as area under disease progress curve (AUDPC) (828.8), while the lowest disease development occurred with tooth pick inoculum (RLH 47.1% and AUDPC 626.8). The interaction between genotypes and inoculum sources was significant. Rice varieties Tetep and Taducan showed the lower RLH and AUDPC as compared to all other genotypes with different inoculum sources. These results provide a basis to design methods of evaluation for sheath blight resistance with high precision in rice genotypes.
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Data availability
The data generated and/or analysed during the present study are attached as supplementary information file and can also be obtained from the corresponding author on request.
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We acknowledge the International Rice Research Institute and Punjab Agricultural University, Ludhiana, India, for providing the seeds of rice genotypes.
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JSL and MSH conducted the experiment and collected the data. SK did statistical analysis. JSL and SK prepared the manuscript.
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Hunjan, M.S., Kumar, S., Lore, J.S. et al. Efficiency of different Rhizoctonia solani inoculum source against sheath blight screening in rice under field conditions. Trop. plant pathol. 47, 309–313 (2022). https://doi.org/10.1007/s40858-021-00489-3
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DOI: https://doi.org/10.1007/s40858-021-00489-3