The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Weeding Efficacy of Sulfonylurea Resistance Weed, Monochoria (Monochoria vaginalis) with Brown Leaf Blight Caused by BWC01-54

  • Hong, Yeon-Kyu (Plant Environment Division, Yeongnam Agricultural Research Institute, RDA) ;
  • Lee, Bong-Choon (Plant Environment Division, Yeongnam Agricultural Research Institute, RDA) ;
  • Song, Seok-Bo (Plant Environment Division, Yeongnam Agricultural Research Institute, RDA) ;
  • Hwang, Jae-Bok (Plant Environment Division, Yeongnam Agricultural Research Institute, RDA) ;
  • Park, Sung-Tae (Plant Environment Division, Yeongnam Agricultural Research Institute, RDA)
  • Published : 2005.01.01
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Abstract

A summer annual weed of monochoria (Monochoria vaginalis) grows in the edges of rice paddies, ditches, and moist upland throughout Korea. It is very difficult to control with herbicide because of its sulfonylurea resistance. It is very competitive with fast growing pattern, that can cause reducing yields of rice. Brown leaf blight of monochoria (Monochoria vaginalis) occurred naturally in rice paddy, is first reported in Korea. The fungal isolate BWC01-54 was successfully isolated from the diseased leaves of monochoria. The fungus BWC 01-54 was grown well at $25-28^{\circ}C$, conidia of the greysh black brown mycelia were abundant produced on PDA at 15 days. The fungus was grown well in potato dextrose broth at $28^{\circ}C$ and fully grown within 10 days in 250 ml of flask. In host and pathogenicity test, conidia suspension of BWC01-54 was the most effective to control of monochoria compare to others isolates. Typical symptoms having pin point brown lesions were formed on stem and leaf and which severely affected the whole plants ware blighted within two weeks, respectively. Under paddies field condition, conidial suspension of the fungus BWC01-54 gave around 90% control. Therefore, we conclude that the fungus may have a potential as a biological control agent against sulfonylurea resistance weed in rice paddy.

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References

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