A Comprehensive Survey and Assessment of Rice Blast Disease Incidence from Major Rice Growing Districts of Telangana State, India

K. Aravind *

Department of Plant Pathology, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad 500030, India.

B. Rajeswari

Department of Plant Pathology, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad 500030, India.

T. Kiran Babu

Institute of Rice Research, Agriculture Research Institute, PJTSAU, Rajendranagar, Hyderabad 500030, India.

S.N.C.V.L. Pushpavalli

Institute of Biotechnology, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad 500030, India.

Emani Rajeswari

Department of Plant Pathology, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad 500030, India.

*Author to whom correspondence should be addressed.


Abstract

Aim: The aim of this study was to assess the incidence and severity of rice blast disease caused by Pyricularia grisea in various rice cultivars grown in Telangana State during the kharif season of 2019.

Methodology: A purposive disease survey was conducted in major rice-growing areas of Telangana State. Disease incidence and severity were recorded from the tillering to grain hardening stage. Percentage disease incidence and severity were calculated at each sampling location. Additionally, pathogenicity tests were conducted on susceptible rice cultivar TN-1 using different isolates of P. grisea.

Results: The study revealed significant variations in rice blast disease incidence and severity across the surveyed areas. Disease incidence ranged from 18.5% in Mancherial to 79.41% in Peddapalli, while severity ranged from 22.2% to 85.1%. All sampled cultivars exhibited varying degrees of susceptibility, with severity scores ranging from moderately resistant (2.0) to highly susceptible (9.0). TN-1 showed the highest blast severity, while WGL 1368 exhibited the least severity. Pathogenicity tests showed significant differences among P. grisea isolates, with reactions on TN-1 ranging from moderately susceptible (4.0 to 5.0) to highly susceptible (8.0 to 9.0).

Conclusion: The study highlights the widespread occurrence of rice blast disease in Telangana State and underscores the varying susceptibility levels among rice cultivars. These findings emphasize the importance of continued monitoring and management strategies to mitigate the impact of rice blast disease on rice production in the region.

Keywords: Rice blast, Pyricularia grisea, percent disease index, disease severity


How to Cite

Aravind, K., Rajeswari, B., Babu, T. K., Pushpavalli, S., & Rajeswari, E. (2024). A Comprehensive Survey and Assessment of Rice Blast Disease Incidence from Major Rice Growing Districts of Telangana State, India. Journal of Experimental Agriculture International, 46(6), 484–491. https://doi.org/10.9734/jeai/2024/v46i62500

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References

Scardaci SC. Rice blast: A new disease in California. Agronomy Fact Sheet Series. Department of Agronomy and Range Science, University of California, Davis; 1997.

Yellareddygari SKR, Reddy MS, Kloepper JW, Lawrence KS, Fadamiro H. Rice sheath blight: A review of disease and pathogen management approaches. Journal of Plant Pathology and Microbiology. 2014;5:241.

Gangopdhyay S, Chakrabarti NK. Sheath blight of rice. Annual Review of Plant Pathology. 1982;61:451- 460.

Ou SH. Rice Diseases, second ed. Commonwealth Mycological Institute, Kew, Surrey, UK; 1985.

Jia Y, Valent B, Lee FN. Determination of host responses to Magnaporthe grisea on detached rice leaves using a spot inoculation method. Plant Disease. 2003; 87:129-133.

IRRI. Standard Evaluation System for Rice (SES) (4 edition, 15-16) International Rice Research Institute. Philippines; 2014.

Bhaskar B, Devi SJ, Kumar SV, Rajan CPD, Reddy BR, Prasad MS. Assessment of blast disease incidence in major rice growing areas of Andhra Pradesh state, India. International Journal of Agriculture Sciences. 2018;10(19):7336-7338.

ISSN. 2018:0975-3710.

Onaga G, Asea G. Occurrence of rice blast (Magnaporthe oryzae) and identification of potential resistance sources in Uganda. Crop Protection. 2016;80:65-72.

Yashaswini, Reddy PN, Pushpavati B, Srinivasa Rao, Ch, Madhav MS. Prevalence of rice blast (Magnaporthe oryzae) incidence in South India. Bulletin of Environment, Pharmacology and Life Sciences. 2017;6(1):370-373.

Srivastava D, Shamim MD, Kumar D, Pandey P, Khan NA, Singh KN. Morphological and molecular characterization of Pyricularia oryzae causing rice blast from north India. International Journal of Scientific and Research Publications. 2014;4 (7):1-9.

Saifaullah MAK, Khan NA, Mahmood Y. Effect of epidemiological factors on the incidence of paddy blast (Pyricularia oryzae) disease. Pakisthan Journal of Phytopathology. 2011;23:108-111.

Prasad MS, Madhav MS, Laha GS, Ladhalakhmi D, Krishnaveni D, Mangrauthia SK, Balachandran SM, Sundaram RM, Arunakranthi B, Madhan Mohan K, Madhavi KR, Kumar V, Viraktamath BC. Technical Bulletin No. 57. Directorate of Rice Research (ICAR), Rajendranagar, Hyderabad-500030, A.P, India. 2011;1-50.

Ghatak A, Willocquet L, Savary S, Kumar J. Variability in aggressiveness of rice blast (Magnaporthe oryzae) isolates originating from rice leaves and necks. A case of pathogen specialization. 2013;8(6): 66180.