Streptomycetes consider as an important source of bioactive natural compounds. They are play an
important role with tremendous applications in biological and biotechnological fields. Marine streptomycetes are
particularly important microorganisms. Seven streptomycetes isolates were obtained from a marine source and tested for
their ability to produce bioactive secondary metabolites. Their Antibacterial activity against were tested against a variety
of potato pathogenic bacteria, including those that cause potato brown rot and soft rot illnesses. Using semi-selective
media, Ralstonia solanacearum (a soil-borne pathogen) that cause potato brown rot was previously isolated from
illnesses of potatoes with typical brown rot symptoms (SMSA). While the bacterium that causes potato soft rot
(Pectobacterium atrosepticum) was isolated from infected potatoes and showed soft rot symptoms on logan's medium.