The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Comparison of Microbial Fungicides in Antagonistic Activities Related to the Biological Control of Phytophthora Blight in Chili Pepper Caused by Phytophthora capsici

  • Kim, Sang-Gyu (Department of Agricultural Biotechnology, Seoul National University) ;
  • Jang, Ye-Lim (Department of Agricultural Biotechnology, Seoul National University) ;
  • Kim, Hye-Young (Department of Agricultural Biotechnology, Seoul National University) ;
  • Koh, Young-Jin (Department of Plant Medicine, Sunchon National University) ;
  • Kim, Young-Ho (Department of Agricultural Biotechnology, Seoul National University)
  • Received : 2010.08.03
  • Accepted : 2010.10.10
  • Published : 2010.12.01
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Abstract

Two similar microbial fungicides (termed as MA and MB) developed in a Korean biopesticide company were analyzed and compared each other in their biocontrol activities against the phytophthora blight of chili pepper caused by Phytophthora capsici. MA and MB contained the microbe Paenibacillus polymyxa and Bacillus subtilis, respectively, with concentrations over those posted on the microbial products. In comparison of the isolated microbes (termed as MAP from MA and MBB from MB) in the antagonistic activities against P. capsici was effective, prominently against zoospore germination, while MBB only significantly inhibited the mycelia growth of the pathogen. Some effectiveness of MAP and MBB was noted in the inhibition of zoosporangium formation and zoospore release from zoosporangia; however, no such large difference between MAP and MBB was noted. In a pot experiment, MA reduced the severity of the phytophthora blight more than MB, suggesting that the disease control efficacy would be more attributable to the inhibition of zoospore germination than mycelia growth of P. capsici. These results also suggest that the similar microbes MA and MB targeting different points in the life cycle of the pathogen differ in the disease control efficacies. Therefore, to develop microbial fungicides it is required to examine the targeting points in the pathogen's life cycle as well as the action mode of antagonistic microorganisms.

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