Phthoramycin, a new antibiotic active against a plant pathogen, Phytophthora sp.

A newantibiotic named phthoramycin was found in the cultured broth of an actinomycete, Streptomyces sp.WK-1875, which was isolated from a soil sample collected at the seashore of Tokyo Bay. Phthoramycin is active against filamentous fungi such as the plant pathogen Phytophthora parasitica.The present com-