Plant Pathology Journal1812-53871812-5425Asian Network for Scientific Information10.3923/ppj.2006.343.349Streptomyces Strains]]>M. GalalAbdel-Moneim 3200653Nine Streptomyces strains were screened for their potential to protect Cucumis sativus from Cucumber Mosaic Virus (CMV). Foliage treatment with the Streptomyces culture filtrates resulted in 50-85% reduction of the mosaic symptoms. S. violatus, S. nasri H35, Streptomyces sp., S. aureofaciens and S. violaceuisniger showed the highest five antiphytoviral activities. The filtrate of the five Streptomyces strains showed more antiphytoviral activity when applied before virus inoculation compared to their application after viral inoculation. The most favourable incubation period for the highest antiphytoviral activity detected in the filtrates were attained after incubation for 6 h. 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