Abstract
From taxonomic study of the strain 2A-327 which produces antibiotics showing an especially inhibitory activity against Piricularia oryzae in vitro and in vivo, it was seemed that no species described in Bergey's Manual could agree with this. So this strain was named Streptomyces griseochro-mogenes Fukunaga. Czapek's medium proved to be most suitable as for active substance production by shaking culture.
The three fraction all showing growth inhibitory activity against various fungi, yeast and phytopathogenic fungi were obtained from the culture filtrate. They are seemed to differ from the known antibiotics shown in previous literature, in regard to ultraviolet absorption, solu-bility, paper chromatogram and antimi-crobial spectrum. Therefore, they are named blasticidin A, B and C.
