| Effects of Streptomyces griseofuscus 200401 on Melon Powdery Mildew in Greenhouse |
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Tae Heon Lim, Jeong Sang Cho, Sang Jae Kang, Iruthayasamy Johnson, Byeongjin Cha, Yong Hwa Choi |
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| Abstract |
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The fermentation broth (FB) of Streptomyces griseofuscus 200401 isolated from non-farming soil showed antagonistic activity against powdery mildew fungus both in melon leaf/seedling assay and in field trials. The FB of S. griseofuscus 200401 was tested at different concentrations. In primary test, the control value of 2- fold diluted FB of S. griseofuscus 200401, compared to control, reached to 82.8%. The protective activity recorded 80.5% in 2-fold dilution of FB. The effect was reduced to 28.9% in high dilution (100-fold) treatment. The curative effect was relatively lower than protective activity. In field test, the antifungal activities of S. griseofuscus 200401 remained low in blocks sprayed with 100-fold diluted FB and the control values were 15.2 and 15.9% in 2005 and 2006, respectively. However, the activities were as high as 65% and 67.3% in the blocks treated with 2-fold dilution of FB during the same period. |
| Key Words:
antifungal activity, melon, powdery mildew, Streptomyces griseofuscus |
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