On embodiment of the present invention discloses Brassica oleracea plants with a resistance gene to Mycosphaerella brassicicola. An embodiment of the invention also discloses a method for providing a Brassica oleracea plant with a resistance to Mycosphaerella brassicicola, including providing a first B. oleracea plant, which plant includes a resistance gene to M. brassicicola; crossing the resistant plant with a susceptible second B. oleracea plant; isolating from the progeny genomic DNA for detecting the presence of an introgression with the resistance gene using one or more specific DNA markers linked to the resistance gene; and selecting from the progeny a B. oleracea plant in which the presence of the introgression with the resistance gene has been demonstrated.