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KMID : 0903520050480010040
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2005 Volume.48 No. 1 p.40 ~ p.47
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A Multi-microbial Biofungicide for the Biological Control against Several Important Plant Pathogenic Fungi
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Jung Hee-Kyoung
Ryoo Jae-Cheon
Kim Sang-Dal
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Abstract
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In order to develop a multi-microbial biofungicide against several important plant pathogenic fungi, strains were isolated from the phtophthora blight suppressive red-pepper field soil of Gyeongsangbuk-do, Korea. Strains AY1, AY6, AB1, BB2 and F4, which had strong antagonistic ability against Phytophthota capsici and Fusarium oxysporum, were selected for their involvement with strains of biocontrol fungicide. There were no antagonism among the selected strains and were compatible for making the biofungicide. Their antagonistic mechanisms, except for strain BB2, were an antibiosis by the production of antibiotic, while BB2 produced not only an antibiotic but also cellulase as an antagonistic mechanism against blight causing P. capsici. They were identified as Halobacterium sp. AB1, Xenorhadus sp. AY1, Bacillus sp. AY6, Bacillus sp. BB2, Zymomonas sp. F4 by various cultural, biochemical test and BiologTM System 4.0. The highest levels of antifungal antibiotic could be produced after 48 hrs of incubation under the optimal medium which were 0.1% galactose, 0.1% NaNO2, 5mM Na2·HPO4 (pH 5.5). The cultured multi-microbial biofungicide showed strong biocontrol activity against bacterial wilt disease and fusarium wilt disease in cucumber and tomato fields.
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KEYWORD
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biocontrol, microbial agent, Phytophthota capsici, Fusarium oxysporum
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