Weed & Turfgrass Science

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Glyphosate Resistant Conyza canadensis Occurring in Tangerine Orchards of Jeju Province of Korea

  • Bo, Aung Bo (Department of Crop Science, Chungnam National University) ;
  • Won, Ok Jae (Department of Crop Science, Chungnam National University) ;
  • Park, In Kon (Syngenta Korea Jincheon Station) ;
  • Roh, Sug-Won (Rural Development Administration Food Crop Industry Technology Service Division) ;
  • Park, Kee Woong (Department of Crop Science, Chungnam National University)
  • Received : 2017.08.10
  • Accepted : 2017.08.29
  • Published : 2017.12.31
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Abstract

Conyza canadensis is the weed species which most frequently develops resistance to glyphosate in many agricultural crop fields. The continuous use of glyphosate has resulted in the spontaneous occurrences of resistant biotypes. This research was conducted to investigate the response of suspected C. canadensis biotypes to glyphosate. Seeds of C. canadensis were collected from 18 sites in tangerine orchards in Jeju province of Korea. In the preliminary screening, 6 resistant and 12 susceptible biotypes were found at the recommended glyphosate rate ($3.28kga.i.ha^{-1}$). The susceptible biotypes were completely killed at the field application rate whereas the resistant biotypes were initially injured but recovered 14 days after glyphosate application. This is the first case of glyphosate resistance found in Korea despite the national ban on genetically modified glyphosate tolerant crops cultivation. Extended monitoring should be conducted to understand how widely spread the glyphosate resistant C. canadensis is and to estimate the severity of this weed problem in the tangerine orchards of Korea.

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References

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