Black rot is the most widespread and devastating disease in Brassica oleracea crops. The objective of this work was to identify new sources of resistance to races 1 and 4 of Xcc in 46 B. oleracea accessions and to understand genetics of resistance. Most of the accessions were susceptible to both the races, except accessions BR-207, BR-1, BR-202-2 and AL-15 of botrytis group to Xcc race 1. The partial resistant plants were observed in some accessions BR-202-2 (90 % plants) and AL-27 (10 % plants) of botrytis, DJ8012 (20 % plants) of capitata, 005426 (10 % plants) of italica. All the accessions were susceptible to Xcc race 4 except one accession (DJ8012) in cabbage (capitata group) with mean disease score of 7.0 and 10 % plants were found partial resistant. The genetics of resistance in accession BR-207 (botrytis group) was investigated by crossing this with susceptible accessions (Pusa Himjyoti and Pusa Sharad). For the genetics study, F1, F2, F3 and backcrosses (BC1P1 and BC1P2) generations of (Pusa Himjyoti x BR-207) and (Pusa Sharad x BR-207) were evaluated. Segregation ratios obtained were compared by Chi square test at 5 % probability. The F1 generations were resistant and segregation ratio of resistant and susceptible plants indicated 3(R):1(S) in F2 and 1(R):2 (Seg):1(S) in F3 which suggested that resistance to Xcc race 1 in BR-207 is governed by a single dominant gene. The information obtained in this study could be valuable for black rot resistance breeding and in planning a systematic breeding programme to incorporate the black rot resistance into the susceptible cultivars.