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박연기(Yeon-Ki Park),박경훈(Kyeong-Hoon Park),주진복(Jin-Bok Joo),경기성(Kee-Sung Kyung),김병석(Byung-Seok Kim),신진섭(Jin-Sup Shin),류갑희(Gap-Hee Ryu),배철한(Chul-han Bae),이규승(Kyu-Seung Lee) 한국농약과학회 2003 농약과학회지 Vol.7 No.2
A toxicological study of the pesticides for rice paddy to loach was conducted with iprobenfos 17% GR, diazinon 3% GR, and butachlor 5% GR to establish the field test method and their toxicological effects on loach under the actual field conditions. The type C of cage was more effective in the sense of a little stress from the cage. The nets for shading and for preventing the birds were necessary to maintain the water temperature and to prevent the predators. The cumulative mortality of loach exposed to iprobenfos 17% GR, diazinon 3% GR and butachlor 5% GR were 10, 55 and 22%, respectively, during 7 days of exposure. The averaged concentration of the pesticides in paddy water 2 days after application were 1.67, 0.22 and 0.26 ㎎/ℓ, and mortalities were 7, 50 and 17%, respectively, representing the similar results with acute toxicity (48h-LC??).
박경훈(Kyung Hun Park),박연기(Yeon Ki Park),주진복(Jin Bok Joo),경기성(Kee Sung Kyung),신진섭(Jin Sup Shin),김찬섭(Chan Sub Kim),박병준(Byung Jun Park),엄재열(Jae Youl Uhm) 한국농약과학회 2003 농약과학회지 Vol.7 No.4
To assess the risk of pesticides on earthworm, the acute toxicities of 10 pesticides were investigated and their toxicity exposure ratios(TERs) were calculated. As the TERs of paraquat dichloride and pendimethalin were more than 100, their risks were rated negligible. Risk of benfuracarb, cadusafos, chlorpyrifos-methyl, endosulfan, isazofos and parathion which have TERs of 10~100 were rated low. However, risk of imidacloprid and phorate which have TER of less than 10 were estimated highly to need a reproduction study. Earthworms were exposed to twenty two pesticides including dazomet 98% GR having PECs of more than 5 ㎎ㆍ㎏?¹ in artificial soil at standard and double dose for 14 days. All the earthworms exposed to dazomet 98% GR and metam-sodium 25% SL were died to show their high risk, while no serious adverse effects were observed in the soil treated with 15 pesticides, calcite 95% WP, calcium polysulfide 36% CF, chlorothalonil 75% WP, darninozide 85% WP, dichlonil 6.7% GR, etridiazole 25% EC, fosetyl-Al 80% WP, glyphosate 41% SL, hymexazol 30% SL, iprodione 50% WP, machine oil 95% EC, mancozeb 75% WP, propineb 70% WP, terbuthylazine 80% WP and triazophos 40% EC. In case of thiophanate-methyl 70% WP, copper hydroxide 77% WP, dimethoate 46% EC, tolclofos-methyl 50% WP and propamocarb hydrochloride 67% SL, any effect did not show clearly, suggesting an additional subchronic toxicity study. The risk of thiophanate-methyl 70% WP to earthworm was estimated high, considering its subchronic effect, while effects of copper hydroxide 77% WP, dimethoate 46% EC, tolclofos-methyl 50% WP and propamocarb hydrochloride 67% SL to earthworms were negligible, considering no adverse effects in subchronic tests.