Vol. 9, Issue 7, Part B (2025)

The present investigation entitled “Screening of rice genotypes against bacterial leaf blight and assessment of yield losses in Chhattisgarh” was performed in the department of Plant Pathology, College of Agriculture, IGKV, Raipur, (C.G.). Bacterial leaf blight (BLB) disease is caused by Xanthomonas oryzae pv. oryzae is one of the most devastating diseases. In Chhattisgarh BLB has become a major production constraint among the rice diseases. However, breakdown of resistance of a variety often occurs after few years of release due to genetic adaptation of the pathogen. Regular screening of the genotypes is utmost for developing the resistant genotypes. Considering the point, this investigation effort has been made to screen the rice genotypes against BLB under artificial and natural field condition. In the study, plants were assessed by measuring disease severity. The total 112 and 120 rice hybrid entries were screened for two Kharif seasons 2023-24 and 2024-25 under artificial inoculation against bacterial leaf blight of rice. Despite high disease pressure (LSI of 7.78 and 7.19, respectively), 29733 and 31475 entries showed resistance reactions and majority of entries proving susceptible or highly susceptible. Similarly, evaluation of 25 rice genotypes under natural field conditions genotypes such as Kala Namak and Maheshwari showed resistance. In contrast, susceptible genotypes like TN-1, Swarna and IR-64 suffered significant reductions in grain weight and yield loss from 12.50% in Kala Namak to 35.68% in Swarna.