Isolate ZY-153 was identified as Streptomyces cyaneofuscatus, B-49 Streptomyces kanamyceticu, X-4 Streptomyces rochei and Z-13 Streptomyces flavotricini.In a greenhouse study,the biocontrol efficacy of the four isolates against Verticillium wilt of cotton ranged from 18.7 to 65.8%.