• The Korean Journal of Pesticide Science
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• v.16 no.1
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• pp.62-68
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• 2012

This study evaluated the screening level assessment of ecological health using four biomarkers and four bioindicators of Misgurnus anguillicaudatus as a indicator species in agricultural area of South Korea during May-June 2011. The endocrine disrupting chemical (EDC) indicators, such as vitellogenin (VTG) and gonado-somatic index (GSI), were not significantly changed in the agricultural site (p>0.05), indicating no effects. The biomarkers and bioindicators were compared between two sites of reference site (RS) and the agricultural site (AS) for screening assessment of ecological health. The ethoxyresorufin-O-deethylase (EROD) activity, acetylcholinesterase (AChE) activity, and DNA damage were significantly changed in the AS compared with the RS (p<0.05). But the individual level bioindicators such as condition factor (CF), hepato-somatic index (HSI), and gonado-somatic index (GSI) were not significantly different from reference site (RS). These results may indicate impairments of ecological health by toxic chemicals and environmental conditions. Current this study is based on screening assessment of biochemical and individual level biomarkers and bioindicators, so further study is required additional biomarkers and population or community level bioindicators for more specific health assessments in agricultural areas.

• Korean Journal of Environmental Biology
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• v.34 no.1
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• pp.56-62
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• 2016

Pest population density models are very important to monitor the initial occurrence and to understand the continuous fluctuation pattern of pest in pest management. This is one of the major issues in agriculture because these predictions make pesticides more effective and environmental impact of pesticides less. In this study, we combined and predicted the mortality change of pest caused by pesticides with temperature change and population dynamic model. Sensitive strain of two-spotted spider mite (Tetranychus urticae Koch) with kidney bean leaf as host was exposed to mixed acaricide, Acrinathrin-Spiromesifen and organotin acaricide, Azocyclotin, at 20, 25, 30, and $35^{\circ}C$, respectively. There was significant difference in mortality of T. urticae among pesticides and temperatures. We used DYMEX to simulate population density of T. urticae and predicted that the initial management time and number of chemical control would be changed in the future with climate change. There would be implications for strategies for pest management and selection process of pesticide in the future corresponding climate change.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.10a
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• pp.150.1-150
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• 2003

열무의 안전한 생산을 위한 생산단계에서의 각 농약 잔류량 변화 추이와 최종 소비단계에서의 농산물 안전성 평가자료로 활용하기 위하여 실제 시험포장에 열무를 파종한 후 수확 10일 전에 4 종(diazinon, endosulfan, cypermethrin, cyhalothrin)의 살충제를 각 성분별로 안전사용 기준에 따라 기준량 및 배량의 처리구에 직접 살포하여 열무의 포장상태에서의 잔류량 감소(생물학적 반감기) 변화를 조사하였다. 각 농약별로 2 수준 농도의 표준물질을 첨가하여 실험한 결과 평균회수율은 diazinon 98.7∼99.9%, endosulfan 97.6∼98.5%, cypermethrin 98.3∼99.6%, cyhalothrin 98.4∼99.1%이였고, 검출한계는 diazinon 및 cypermethrin은 0.04 mg/kg, endosulfan은 0.012 mg/kg, cyhalothrin은 0.01 mg/kg 이었다. 약제 살포 후 분해속도가 빠른 성분은 diazinon ＞ endosulfan ＞ cypermethrin ＞cyhalothrin 순이었다. 작물체(열무)내에서 시간의 경과에 따른 잔류량의 변화를 1차 반응으로 표현하여 농약 4종의 살포농도별 생물학적 반감기를 산출한 결과, 기준량 살포의 경우 diazinon 0.9일, endosulfan 2.0일, cypermethrin 2.2일, cyhalothrin 2.5일 그리고 배량 살포의 경우에는 diazinon 1.1일, endosulfan 2.0일, cypermethrin 2.1일, cyhalothrin 2.2일로 나타났다. 안전한 농산물 생산을 위한 열무 중 약제 살포 후 수확일은 잔류허용기준(MRL)을 적용시킬 경우 기준량으로 볼 때 diazinon은 6일 후, endosulfan은 10일 후에 수확하는 것이 바람직한 것으로 나타났으며 합성 피레스로이드계인 cypermethrin과 cyhalothrin은 농약살포 후 2 시간 후에 농약 잔류량이 잔류허용기준 미만으로 나타났다.

• The Korean Journal of Pesticide Science
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• v.11 no.1
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• pp.52-58
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• 2007

ALA (5-aminolevulinic acid) has been proposed as a tetrapyrrole-dependent photodynamic herbicide and insecticide by the action of the protoporphyrinogen IX oxidase (Protox IX). The present study was conducted to determine growth responses of plant and insects to ALA, biodegradable biopesticidal substance. In the paddy condition experiment, plant height and shoot fresh weight of barnyardgrass (Echinochloa crus-galli) was more reduced by ALA than rice plants, even though both plant species show great phytotoxicity. Hairy crabgrass (Digitaria sanguinalis), a monocot weed, was more sensitive to ALA at 5mM under upland condition when ALA applied on the foliage, compared with soybean (Glycine max) as a dicot crop. ALA solutions were tested for their insecticidal and larvicidal activities against Spodaptera exigua (Hubner) and Tetranychus urticae Koch. by foliar application and leaf-dipping method. The result showed higher insecticidal activity of ALA at 10mM and its mixture with insecticide luferon against S. exigua. Strongest insecticidal activity against T. urticae was observed from the ALA solution at 10mM 72 days after application. This results show that ALA solution had potent herbicidal and insecticidal activities against agricultural pests even though their activities were lower than those of synthetic pesticides.

• Agrochemical news magazine
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• v.14 no.6 s.117
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• pp.40-43
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• 1993

• Agrochemical news magazine
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• v.25 no.3 s.196
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• pp.41-43
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• 2004

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• v.15 no.5 s.122
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• pp.36-39
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• Bioindustry News
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• v.10 no.4
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• pp.7-15
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• 1997

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2001.06a
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• pp.104-104
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• 2001