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KMID : 0545120090190050520
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Journal of Microbiology and Biotechnology
2009 Volume.19 No. 5 p.520 ~ p.524
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Biological Control of Strawberry Fusarium Wilt Caused by Fusarium oxysporum f. sp. fragariae Using Bacillus velezensis BS87 and RK1 Formulation
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Nam Myeong-Hyeon
Park Myung-Soo
Kim Hong-Gi
Yoo Sung-Joon
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Abstract
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Two isolates, Bacillus sp. BS87 and RK1, selected from soil in strawberry fields in Korea, showed high levels of antagonism towards Fusarium oxysporum f. sp. fragariae in vitro. The isolates were identified as B. velezensis based on the homology of their gyrA sequences to reference strains. BS87 and RK1 were evaluated for control of Fusarium wilt in strawberries in pot trials and field trials conducted in Nonsan, Korea. In the pot trials, the optimum applied concentration of BS87 and RK1 for pre-plant root-dip application to control Fusarium wilt was 105 and 106 colony-forming units (CFU)/ml, respectively. Meanwhile, in the 2003 and 2005 field trials, the biological control efficacies of formulations of RK1 were similar to that of a conventional fungicide (copper hydroxide) when compared with a non-treated control. The RK1 formulation was also more effective than BS87 in suppressing Fusarium wilt under field conditions. Therefore, the results indicated that formulation of B.velezensis BS87 and RK1 may have potential to control Fusarium wilt in strawberries.
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KEYWORD
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Bacillus velezensis, biological control, Fusarium wilt, strawberry
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