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

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))
Publication Information
The Korean Journal of Pesticide Science / v.13, no.4, 2009 , pp. 256-261 More about this Journal
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.
Keywords
molinate; acute toxicity; Chironomus riparius; Cloeon dipterum; aquatic insect;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
연도 인용수 순위
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