The Plant Pathology Journal 2008;24(1):63-66.
Published online March 31, 2008.
Effects of Streptomyces griseofuscus 200401 on Melon Powdery Mildew in Greenhouse
Tae Heon Lim, Jeong Sang Cho, Sang Jae Kang, Iruthayasamy Johnson, Byeongjin Cha, Yong Hwa Choi
Abstract
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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