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http://dx.doi.org/10.5423/RPD.2007.13.1.040

Control of Powdery Mildew of Pepper Using Culture Solutions of Chitinolytic Bacteria, Chromobacterium sp. and Lysobacter enzymogenes  

Seo, Chong-Chan (Department of Agricultural Biology, Sunchon National University)
Jung, Hyun-Chae (Department of Forest Resources, Sunchon National University)
Park, Seur-Kee (Department of Agricultural Biology, Sunchon National University)
Publication Information
Research in Plant Disease / v.13, no.1, 2007 , pp. 40-44 More about this Journal
Abstract
Powdery mildew of pepper is one of the most devastating diseases which is occurring all the year under greenhouse condition. In this study, control efficacy against powdery mildew was evaluated by mixed culture solutions of two chitinolytic bacteria, Lysobacter enzymogenenes strain C-3 and Chrornobacterium sp. strain C-61, cultivated in the chitin-supplemented medium. In all experiments, white powder on the reverse side of pepper leaves perfectly disappeared 3 days after application of mixed culture solutions. However, periods required for formation of new white powder on the same sites after application (control-lasting period) were largely differed according to environmental conditions. In particular, the control-lasting period was much longer when sprayed on 6 PM than 9 AM and especially, on rainy days than sunny days. This indicates that control efficacy of culture solution may be largely affected by environmental conditions after application. The undiluted culture solution resulted in a perfect control with control value more than 95% by application of 5-day-intervals under severely diseased field and 7-day-intervals under disease-started field. A ten-fold diluted product also showed control value more than 81% by application of the same method. These results suggest that this culture solution can be practically used to control powdery mildew disease in pepper plants.
Keywords
Chitinolytic bacteria; Control; Culture solution; Pepper; Powdery mildew;
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