Streptomyces scabies, a gram-positive actinomycetes, causes common scab which is an economically important disease of potato worldwide. The disease is characterized by formation of superficial, raised or pitted lesions on the surface of potato tubers. Such lesions reduce the market value and processing potential of [potato crop and result in significant loss to the growers. The disease development relies on various Pathogenicity and viridenic elements such as production of secondary metabolites thaxtomins (Txt proteins), a secreted saponinase (TomA) and a secreted necrogenic protein (Noc1), other streptomyces phytotoxic secondary metabolites that have been identified include concanamycins, Fo-891 and borrelidin. Furthermore, there is evidence that additional unknown metabolites may be responsible for streptomyces pathogenicity.