Bio-efficacy and post harvest residual toxicity of new fungicides against sheath blight (Rhizoctonia solani) of rice (Oryza sativa)

PANKAJ KUMAR; SUSHIL AHLAWAT; REENA CHAUHAN; ANIL KUMAR; RAM SINGH; ASHWANI KUMAR

doi:10.56093/ijas.v88i10.84228

Authors

PANKAJ KUMAR Ph D Scholar, Department of Plant Pathology, CCS Haryana Agricultural University, Hisar, Haryana 125 004
SUSHIL AHLAWAT Assistant Professor, CCS Haryana Agricultural University, Hisar, Haryana 125 004
REENA CHAUHAN Research Associate, Department of Entomology, CCS Haryana Agricultural University, Hisar, Haryana 125 004
ANIL KUMAR Professor and Head, Department of Plant Pathology, CCS Haryana Agricultural University, Hisar, Haryana 125 004
RAM SINGH Principal Scientist cum Regional Director, Department of Plant Pathology, CCS Haryana Agricultural University, Hisar, Haryana 125 004
ASHWANI KUMAR Assistant Professor, Department of Plant Pathology, CCS Haryana Agricultural University, Hisar, Haryana 125 004

DOI:

https://doi.org/10.56093/ijas.v88i10.84228

Keywords:

Bioefficacy, Fungicides, Post-harvest residue, Rhizoctonia solani, Rice, Sheath blight

Abstract

Four new fungicidal formulations, viz. tebuconazole 50% + trifloxystrobin 25% WG, difenoconazole 25% SC, propiconazole 13.9% + difenconazole 13.9% EC and kresoxim methyl 44.3% SC were evaluated against Rhizoctonia solani Kuhn of rice (Oryza sativa L.) in vitro and under field conditions during kharif 2016 and 2017. In vitro growth inhibition tests revealed that the EC₅₀ values of tebuconazole 50% + trifloxystrobin 25% WG, difenoconazole 25% SC, propiconazole 13.9% + difenconazole 13.9% EC and kresoxim methyl 44.3% SC against R. solani ranged from 0.398 o 42.35 ppm a.i., whereas the corresponding EC₉₀ values were 8.92 to more than 2000 ppm a.i. Tebuconazole 50% + trifloxystrobin 25% WG was most inhibitory to mycelial growth of the fungus with EC₅₀ and EC₉₀ values of 0.39 and 8.92 ppm a.i. followed by propiconazole 13.9% + difenconazole 13.9% EC. Tebuconazole 50% + trifloxystrobin 25% WG and propiconazole 13.9% + difenconazole 13.9% EC completely inhibited the sclerotia formation at 2.5 ppm and 25 ppm a.i., respectively. In field trials, tebuconazole 50% + trifloxystrobin 25% WG sprayed at 0.4 and 0.8 g/l proved most effective and suppressed sheath blight severity by 50.98 and 79.12%, respectively along with enhancing grain yield of rice followed by propiconazole 13.9% + difenconazole 13.9% EC. However, kresoxim methyl 44.3% SC was the least effective fungicide. Based on bioefficacy and benefit-cost ratio, spray application of tebuconazole 50% + trifloxystrobin 25% WG at 0.4 g/l and propiconazole 13.9% + difenconazole 13.9% EC at 2 ml/l were found highly economical in managing sheath blight of rice with a benefit-cost of 3.52 and 3.02, respectively. Post harvest residues analysis of tebuconazole 50% + trifloxystrobin 25% WG, propiconazole 13.9% + difenconazole 13.9% EC and difenoconazole 25% SC were found below limit of quantification, i.e. 0.01 ppm in rice grains, cropped soil, paddy straw and husk at their single/recommended and double of the recommended doses indicating that tebuconazole 50% + trifloxystrobin 25% WG at 0.4 g/l and propiconazole 13.9% + difenconazole 13.9% EC were safe from the human, animals and environmental point of view.

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References

Agrawal M and Sunder S. 2013. Effect of fungicides and non-conventional chemicals on Rhizoctonia solani AG 1 IA and sheath blight disease of rice. Plant Disease Research 28: 39–44.

Anonymous. 2016. Agricultural Statistics at a Glance 2016, Directorate of Economics and Statistics, Ministry of Agriculture and Farmers’ Welfare, Department of Agricultural Cooperation and Farmers’ Welfare, Government of India, pp 87–9.

Arora S, Mukherji I, Kumar A and Tanwar R K. 2014. Pesticide residue analysis of soil, water and grain of IPM basmati rice. Environmental Monitoring and Assessment. 186: 8765–72. DOI: https://doi.org/10.1007/s10661-014-4042-9

Chen W, Li M, Li W, Wu X and Han L. 2015. Dissipation and residue level of thifluzamide in rice field ecosystem. Journal of Chemistry 2015, Article ID 848252, 8 pages, http://dx.doi.org/10.1155/2015/848252. DOI: https://doi.org/10.1155/2015/848252

Hunjan M S, Lore J S, Pannu P P S and Thind T S. 2011. Performance of some new fungicides against sheath blight and brown spot of rice. Plant Disease Research. 26: 61–7.

Kumar P, Sunder S, Singh R and Kumar A. 2016. Management of foot rot and bakanae of rice through fungicides. Indian Phytopathology 69: 124–7.

Kumari B, Madan V K and Kathpal T S. 2008. Status of insecticide contamination of soil and water in Haryana, India. Environmental Monitoring Assessment 136: 239–44. DOI: https://doi.org/10.1007/s10661-007-9679-1

Kundu C, Goon A and Bhattacharyya A. 2011. Harvest residue study of fungicide tebuconazole EC formulation in groundnut and paddy. Journal of Environmental Protection 2: 424–8. DOI: https://doi.org/10.4236/jep.2011.24048

Laha G S, Singh R, Ladhalakshmi D, Sunder S, Prasad M S, Dagar C S and Ravindra Babu V. 2017. Importance and management of rice diseases: A global perspective. (In) Rice Production Worldwide, pp 303–60. Springer International Publishing, AG 2017. DOI: https://doi.org/10.1007/978-3-319-47516-5_13

Lin H T, Wong S S and Li G S. 2001. Dissipation of epoxiconazole in the paddy field water under subtropical conditions of Taiwan. Journal of Environmental Science and Health Part B 364: 409–20. DOI: https://doi.org/10.1081/PFC-100104185

Lore J S, Hunjan M S and Sharma N. 2012. Evaluation of some new fungicide formulations to control sheath blight and brown spot in rice. Indian Phytopathology 65: 244–8.

Mishra D S and Sinha A P. 1999. Laboratory evaluation of fungicides against Rhizoctonia solani Kuhn, the cause of sheath blight of rice. Agricultural Science Digest 19: 211–3.

Singh R, Sunder S and Dodan D S. 2010. Standardization of inoculation method in nursery beds and management of sheath blight of rice through host resistance, chemicals and botanicals. Indian Phytopathology 63: 286–91.

Singh R, Sunder S and Dodan D S. 2013. Status of rice diseases in Haryana. Plant Disease Research 28: 181–5.

Singh R, Sunder S and Kumar P. 2016. Sheath blight of rice: current status and perspectives. Indian Phytopathology 69: 340–51.

Sondhia S, Singh V P and Yaduraju, N T. 2006. Persistence of butachlor in sandy clay loam soil and detection of its residues in rice grains and straw. Annals of Plant Protection and Sciences 14: 206–9.

Sunder S, Singh R and Dodan D S. 2003. Standardization of inoculation methods and management of sheath blight of rice. Indian Journal of Plant Pathology 21: 92–6.

Tiwari R K S, Chandravanshi S S, Ojha B M and Thakur, B S. 2002. In vitro and in vivo efficacy of new fungicides against Rhizoctonia solani causing sheath blight of rice. Journal of Mycology and Plant Pathology 32: 418 (Abstr.).

Wang K, Wu J Y and Zhang H Y. 2012. Dissipation of difenoconazole in rice, paddy soil and paddy water under field conditions. Ecotoxicology and Environmental Safety 86: 111–5. DOI: https://doi.org/10.1016/j.ecoenv.2012.08.026