Control of Ginseng Damping-off by Streptomyces sp. A75 and A501

Sang-Yeop  Lee1,*   Jaekyeong  Song1   Bong-Sik  Yun1   Kyeong hun  Park2   Jeong Jun Kim3   Ji Hee Han3   

1Agricultural Microbiology Division, National Academy of Agricultural Science
2Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University
3Ginseng Research Division, National Institute of Horticultural and Herbal Science

Abstract

Streptomyces sp. A75 and A501 inhibited the mycelial growth of pathogenic Rhizoctonia solani and Pythium sp., which cause the ginseng disease known as damping-off. Three methods were evaluated for the control of these pathogens, using a mixture of the culture broths from Streptomyces sp. A75 and A501. The methods tested were seed dipping with 50-fold diluted broth, drenching of soil with 100-fold diluted broth after sowing, and combined seed dipping and drenching. These methods reduced the incidence of ginseng damping-off caused by R. solani by 81.3%, 84.8%, and 32.2% and that caused by Pythium sp. by 51.0%, 52.1%, and 75.3%, respectively. Based on these results, the combination of seed dipping and soil drenching after sowing using a mixture of the culture broths from Streptomyces sp. A75 and A501 effectively reduced the incidence of damping- off in ginseng.

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