An effective biocontrol bioformulation against Phytophthora blight of pepper using growth mixtures of combined chitinolytic bacteria under different field conditions |
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Authors: | Young Cheol Kim Hyunchae Jung Kil Yong Kim Seur Kee Park |
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Institution: | (1) Environmental-Friendly Agriculture Research Centre, Chonnam National University, Gwangju, 500-757, Republic of Korea;(2) Department of Forest Resources, Sunchon National University, Sunchon, 540-742, Republic of Korea;(3) Department of Agricultural Biology, Sunchon National University, Sunchon, 540-742, Republic of Korea |
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Abstract: | Phytophthora blight of pepper caused by Phytophthora capsici has devastating consequences when combined with other pathogens, including Rhizoctonia solani, Fusarium oxysporum, and Fusarium solani. In order to develop a field-effective biocontrol strategy against Phytophthora blight of pepper, three chitinolytic bacteria,
Serratia
plymuthica strain C-1, strongly antagonistic to P. capsici, Chromobacterium sp. strain C-61, strongly antagonistic to R. solani, and Lysobacter enzymogenes strain C-3, antagonistic to R. solani and Fusarium spp., were selected. In pot studies, application of cultures combining the three bacterial strains effectively suppressed
Phytophthora blight more than application of any single bacterial strain. Bioformulations developed from growth of the strains
in a simple medium containing chitin under large batch conditions resulted in effective control in field applications. Efficacy
of the bioformulated product depended on both the dose and timing of application. Although the undiluted product suppressed
Phytophthora blight under all field conditions, a 10-fold diluted product was effective in solar-sterilized greenhouses and
in fields with crop rotation. These results suggest that the developed product could be a new effective system to control
Phytophthora blight disease in pepper. |
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Keywords: | Antibiotics Biocontrol Chitinolytic bacteria Phytophthora blight |
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