author(s)
Kola Muthaiah, Pitchaimuthu, Ajay Kumar Pandav, Sriram S, Padmini K and Usharani TR

abstract
This study was conducted during in 2017, under natural epiphytotic conditions. Screening and evaluation of 37 onion genotypes carried out against purple blotch disease. The disease severity was ranging from 8.00% to 80.00% among genotypes during the experiment 2017.bThe analysized data of all the 37 genotypes showed different degrees of resistant against disease. The experimental results indicates that one genotype was found to be resistant, 11 genotypes were found moderately resistance, other 11 genotypes were found moderately susceptible, another ten genotypes were found susceptible and four other genotypes were found highly susceptible. Minimum and maximum disease severity were observed in in Arka Kalyan MST-764 (PBR) (8.00%) and Bellary Local-816 (80.00%) respectively. Moderate resistance found in the genotypes viz., Sangam Selection (10.67%), (L₁) ms-603 (ms-65) old (12.00%), Bhima Super (13.33%), Komta Local (14.67%), Bhima Red (14.67%) and 15-RHRO-57. None of the genotypes were found to be immune. Therefore, the resistance and moderately resistance genotypes identified during the investigation can be used in future breeding programs for the development of purple blotch resistant hybrids and varieties in onion.