Streptomyces microflavus is a bacterium species from the genus of Streptomyces which has been isolated from soil. Streptomyces microflavus produces nemadectin, fattiviracin A1, milbemycin and deoxyuridines. Streptomyces microflavus also produces the ionophore valinomycin. Streptomyces microflavus is also known to cause potato common scab disease in Korea.