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KMID : 0379119910190030231
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Korean Journal of Mycology
1991 Volume.19 No. 3 p.231 ~ p.237
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Biological Control with Streptomyces sp. on Fusarium oxysporum f. sp. vasinfectum and Phytophthora nicotianae var. parasitica Causing Sesame Wilt and Blight
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Abstract
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This study was conducted in order to find out biological control of sesame wilt and blight caused by Fusarium oxysporum f. sp. vasinfectum and Phytophthora uicotianae var. parasitica by using Streptomyces spp. Two sesame pathogens, Fusarium oxysporum f. sp. vasinfectum and Phytophthora niccrtianae var. parasitica were purely isolated from diseased sesame plants of the field. Streptomyces species were isolated from 72 soil samples collected from red pepper and sesame uplands in Chungbuk and selected as antagonists according to the results of dual culture. The selected Streptomyces isolates such as St-11 and St-20 were confirmed their antagonistic effect through mycelial inhibition zone and inhibitory effects on the mycelial growth of the pathogens by culture filterate of the antagonists. Inhibitory effects on the conidial germination of Fusarium oxysporum vasinfectum and Phytophthora nicotianae parasitica by the antagonists were also tested in addition to mycelial lysis. The antagonists St-11 and St-20 showed inhibitory effect on growth of sesame seedlings after seeds soaked in the suspension. Effect of soil inoculation with antagonist St-11 showed 40 to 78 percent of control effect for two diseases in comparison with control under greenhouse.
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