The book deals with latest research achievements of Brassica scientists using omics approaches in understanding host-pathogen interaction, molecular detection, identification, and functional characterization of effectors/genes including pathogenomics and biometabolomics. Genomics of host-pathogen interaction is a source of information for the teachers, students, researchers, and policy makers to foster success in enhancing the Brassica production and productivity through the development of improved disease-resistant varieties with the use of omics technologies. It is a base and sound plate form for managing biological stresses of Brassica at global level. The book covers up-to-date information on genomics of host-pathogen interaction, pathogenomics of crucifers’ pathogen, and biometabolomics of host pathosystem supplemented with ample photographs, illustrations, and figures which make it stimulating, effective, and easy to comprehend for readers, researchers, biology students, teachers, and policy makers.