Vol. 11, Issue 7 (2022)

Author(s):
M Arun, G Seshu, B Srinivas and T Yella Goud

Abstract:
Half of the world’s population depends on rice as a staple food. Rice blast caused by Magnaporthe oryzae is one of the destructive diseases of rice causing enormous yield losses in several rice growing areas. Among the different management strategies host plant resistance is proved to be the best strategy to combat the blast disease. The current experiment was carried out to identify the superior rice (Oryza sativa L.) genotypes for blast resistance at regional agricultural research station (RARS) Polasa, Jagtial during rabi 2021-22. In this study, different rice genotypes comprising of 13 parents, 32 hybrids (including two commercial hybrids) along with suitable susceptible check variety (TN-1) were screened by adopting uniform blast nursery (UBN) technique and entries were scored using 0-9 scale of Standard Evaluation system (SES) developed by IRRI, 2002. In this experiment susceptible check TN -1 expressed highly susceptible reaction with score 8 on disease scale, it indicates that there is sufficient inoculum in the field to cause disease. Accordingly, on basis of disease scoring the genotypes were categorized as moderately resistant, moderately susceptible and susceptible genotypes. This experiment revealed that among the 45 tested genotypes none of the genotypes showed highly resistant to blast disease but 9 hybrids and 1 parental line was exhibited moderately resistant, 22 hybrids and 9 parents were moderately susceptible and one hybrid and 3 parents showed susceptible reaction to the blast disease.