Incidence and epidemiology of rice (Oryza sativa) false smut caused by Ustilaginoidea virens in northern India


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Authors

  • PRAHLAD MASURKAR Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh 221 005 India
  • RAKESH KUMAR SINGH Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221005 India
  • MANAS KUMAR BAG ICAR-National Rice Research Institute, Cuttack 753006
  • HAUSILA PRASAD SINGH BRD PG College, Deoria, 274001 India
  • MOHAMMAD EKRAM HUSSAIN Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore, 641003

https://doi.org/10.56093/ijas.v93i12.136310

Keywords:

False smut, ITS markers, Prevalence, Varieties, Weather

Abstract

False smut of rice (Oryza sativa L.) caused by Ustilaginoidea virens (Cooke) Takah., 1896 is an important emerging disease of rice. An experiment was conducted during 2018–19 and 2019–20 at Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh to study the U. virens prevalence and morphological variability in northern India with the effect of weather variables on the percentage disease incidence (PDI) of false smut of rice. The study revealed that the false smut incidence was higher in Varanasi district of Uttar Pradesh (53.64%). The lowest percentage (20.68–27.55%) of infected tillers was found in Kangra district of Himachal Pradesh, and Tehri Garhwal district of Uttarakhand. The grain replacement percentage was highest in the Moti cultivar (51.17%), while the highest yield loss percentage was in the Pusa Basmati (57.11 %) variety. The majority of the isolates in our investigation had fluffy, raised, and irregular colony morphology. The correlation between the false smut disease incidence and weather has been evaluated in the Varanasi district, and found that the temperature of 20.36°C with an RH of 85.13% and low rainfall of 8.92 mm was conducive to disease initiation and positively correlated with the PDI. Other epiphytotic factors like sunshine hours, and wind speed were all found to be negatively linked with PDI. In this investigation, for the first time, the viability of spores was also checked. It was found that 2-year-old spores were not viable because they did not retain any Brilliant Cresyl blue colour dye, which stains the stored food material in spores, while 1-month-old spores were found to be 100% viable. All the isolates were further confirmed with the specific ITS marker.

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Submitted

2023-05-12

Published

2023-12-19

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How to Cite

MASURKAR, P. ., SINGH, R. K. ., BAG, M. K. ., SINGH, H. P. ., & HUSSAIN, M. E. . (2023). Incidence and epidemiology of rice (Oryza sativa) false smut caused by Ustilaginoidea virens in northern India. The Indian Journal of Agricultural Sciences, 93(12), 1291–1296. https://doi.org/10.56093/ijas.v93i12.136310
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