Efficiency of Serratia nematodiphila Sd23 and Bacillus siamensis Ks5 to biological control of Bipolaris oryzae caused brown spot disease in rice

Authors

  • Suwichaya Buachard 1Biology Program, Faculty of Science and Technology, Kamphaeng Phet Rajabhat University, Kamphaeng Phet, 62000.
  • Phawinee Phoothong 1Biology Program, Faculty of Science and Technology, Kamphaeng Phet Rajabhat University, Kamphaeng Phet, 62000.

Keywords:

Serratia nematodiphila, Bacillus siamensis, Bipolaris oryzae, Brown spot disease

Abstract

Bipolaris oryzae, causing brown spot disease in rice, is one of the diseases reducing rice productivity. This research project aimed to test the efficacy of Serratia nematodiphila Sd23 and Bacillus siamensis Ks5 for biological control of Bipolaris oryzae. The efficacy of the crude extract of Bacillus siamensis Ks5 against Bipolaris oryzae DOAC 2464 and Bipolaris oryzae TBRC 10586 were tested using pour plate technique; the crude extract controlled the disease, with 30.0 % and 32.1 %. However, the crude extract of Serratia nematodiphila Sd23 could not inhibit Bipolaris oryzae. The efficacy of the dry formulation of Serratia nematodiphila Sd23 and Bacillus siamensis Ks5 against Bipolaris oryzae were tested using dual culture bioassay; the dry formulation controlled the disease, with 8.8-14.8 % and 40.4-32.8 %, respectively.

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Published

2025-12-30