Confirmation of physiological race of Bipolaris maydis causing maydis leaf blight of maize in India

Maydis leaf blight (MLB) incited by Bipolaris maydis occurs in most of the maize growing regions. Present study revealed morphological divergence among 74 isolates B. collected from geographically distant places India. Based on morpho-cultural features clustered R software, 25 representative were used for race identification. The internal transcribed spacer (ITS) sequence further confirmed as maydis. In recent concept, variation disease incidence and infectivity denotes genetic shift pathogen or introduction new pathogenic race(s) through germplasm exchange. For unveiling Indian maydis, present exploration was made. Four genetically divergent genotypes with cytoplasmic male sterility (CMS), viz. -C (MGU- 161QPV-C), -T 345PV-T), -S (MGU-150Q-S) CM-119 (fertile cytoplasm) assessed using during kharif 2018-19 at ICAR-IARI, New Delhi. genotype MGU-161QPV-C associated CMS-C highly resistant followed MGU-345PV-T (CMS-T) MGU-150Q-S (CMS-S), whereas showed high susceptibility. outcome prevalence 'O' India eliminated uncertainty about occurrence other races, i.e. T C.