Comparison of Acute Toxicity of Molinate on Two Aquatic Insects, Chironomus riparius and Cloeon dipterum in Different Larval Stages

2종의 수서곤충 Chironomus riparius와 Cloeon dipterum의 유충 성장단계별 molinate 급성독성 비교

  • Kim, Byung-Seok (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Park, Yoen-Ki (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Hong, Soon-Sung (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Yang, Yu-Jung (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Park, Kyung-Hun (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Joeng, Mi-Hye (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Kim, Se-Ri (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Park, Kyeong-Hun (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Yeh, Wan-Hae (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Kim, Doo-Ho (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Hong, Moo-Ki (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Ahn, Young-Joon (School of Agricultural Biotechnology, Seoul National University) ;
  • Shin, Jin-Sup (Department of Crop Life Safety, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA))
  • 김병석 (국립농업과학원 농산물안전성부) ;
  • 박연기 (국립농업과학원 농산물안전성부) ;
  • 홍순성 (국립농업과학원 농산물안전성부) ;
  • 양유정 (국립농업과학원 농산물안전성부) ;
  • 박경훈 (국립농업과학원 농산물안전성부) ;
  • 정미혜 (국립농업과학원 농산물안전성부) ;
  • 김세리 (국립농업과학원 농산물안전성부) ;
  • 박경훈 (국립농업과학원 농산물안전성부) ;
  • 예완해 (국립농업과학원 농산물안전성부) ;
  • 김두호 (국립농업과학원 농산물안전성부) ;
  • 홍무기 (국립농업과학원 농산물안전성부) ;
  • 안용준 (서울대학교 농생명공학부) ;
  • 신진섭 (국립농업과학원 농산물안전성부)
  • Published : 2009.12.31

Abstract

Molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate), a selective, preemergence thiocarbamate herbicide used for grass weed control in rice fields, is being most widely used in Korea. This study was conducted to assess the comparative toxicity of molinate on two aquatic insects, Chironomus riparius and Cloeon dipterum in four larval stages. First-instar larvae of C. riparius appeared to be the most sensitive to acute exposure of molinate with a 48-h $EC_{50}$ of 7.8 mg/L, followed by third instar (48-h $EC_{50}\;=\;22.9\;mg/L$), second instar (48-h $EC_{50}\;=\;25.0\;mg/L$) and fourth instar (48-h $EC_{50}$ > 50 mg/L) larvae. Also, the sensitivity of the larvae of C. dipterum was presented as the same manner of the larvae of C. riparius. The youngest group of larvae of C. riparius appeared to be the most sensitive to molinate, with 96-h $EC_{50}$ values ranged from 14.3 to 24.1 mg/L. The authors assume that the young instar lavae of aquatic insects, Chironomus riparius and Cloeon dipterum are more sensitive to molinate. Also, the authors propose that Mayfly, Cloeon dipterum is well suited as a bioassay organism because it is one of the most vulnerable aquatic insects inhabiting agricultural ecosystem in Korea.

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