• Title, Summary, Keyword: 농약감소율

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Change of the Concentration of Pesticide Residues in Pepper Powder by Storage Temperature and Storage Period (저장온도와 기간에 따른 고춧가루 중 농약의 잔류량 변화)

  • Jo, Sung-Ae;Kim, Eun-Hee;Kim, Kyung-Sig;Kim, Jung-Hun;Park, Seog-Gee
    • The Korean Journal of Pesticide Science
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    • v.13 no.3
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    • pp.127-132
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    • 2009
  • The purpose of this study is to examine changes in the pesticides residues in pepper powder by storage conditions. Analysis of pesticide residues was performed using multiresidue analytical methods and the number of pesticides detected from 60 pepper powders was 7 pesticides such as cypermethrin, fenvalerate, kresoxim-methyl, chlorpyrifos, chlorfenapyr azoxystrobin, tebuconazole. The concentrations of cypermethrin and tebuconazole were exceeded their maximum residue limits (MRLs). The degradation patterns of pesticides at $-5^{\circ}C$ were compared to those at $20^{\circ}C$ and $4^{\circ}C$. Without reference to storage temperature, degradation rates of azoxystrobin and fenvalerate were above 80%. Degradation rate of chlorpyrifos was 47% at storage $4^{\circ}C$, $20^{\circ}C$ and 34% at storage $-5^{\circ}C$. During each storage peroid, the degradation patterns were more lower at $-5^{\circ}C$ than at $20^{\circ}C$ and $4^{\circ}C$.

Effects of Ozonated Water Treatment on Pesticide Residues and Catechin Content in Green Tea Leaves (녹차의 잔류농약과 카테친 함량에 미치는 오존수 처리 효과)

  • Jung, Kyung-Hee;Seo, Il-Won;Nam, He-Jung;Shin, Han-Seung
    • Korean Journal of Food Science and Technology
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    • v.40 no.3
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    • pp.265-270
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    • 2008
  • This study examined the effects of treating green tea leaves with ozonated water by evaluating pesticide residue levels and catechin content. The pesticide residue levels of tea leaves treated with carbendazim, captain, diazinon, fenthim, dichlorvos, and chlorpyrifos ranged from 43.2 to 48.2 ppm. For leaves treated by soaking or watering with tap water, or with 0.25 ppm of ozone water for 30 min. Pesticide residue levels were reduced by 24.0-30.2%, 30.3-33.6%, 52.4-70.5%, and 65.5-80.2%, respectively. No major differences in catechin content were observed in the leaves according to the soaking and rinsing treatments using ozonated or tap water.

현재 농약 잔류허용치 미달 만성중독 염려할바 안된다

  • 정영호
    • The Bimonthly Magazine for Agrochemicals and Plant Protection
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    • v.2 no.11
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    • pp.4-10
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    • 1981
  • 현대 농업에서 농약을 사용하지 않는다면 벼의 경우 26.8$\%$의 수량감소를 면치 못하고 있으며, 재배관리가 양호한 사과밭에 농약을 사용하지 않고 사과를 재배한 결과 약 40$\%$의 수량 감소를 보였을 뿐 아니라 시장에서 상품으로서의 불합격율이 80$\%$에 달하였다.

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Honeybee Toxicity by Residues on Tomato Foliage of Systemic Insecticides Applied to the Soil (침투이행성 농약의 토양처리 후 토마토잎에서의 잔류에 의한 꿀벌 독성)

  • Bae, Chul-Han;Cho, Kyung-Won;Kim, Yeon-Sik;Park, Hyun-Ju;Shin, Kwan-Seop;Park, Yeon-Ki;Lee, Kyu-Seung
    • The Korean Journal of Pesticide Science
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    • v.17 no.3
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    • pp.178-184
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    • 2013
  • Residual toxicity test to honeybee was conducted to evaluate an indirect effects on honeybee after planting hole application of systemic insecticides which were highly toxic to honeybee (Apis mellifera). In this study, It was applied three application rates in the planting hole by three systemic insecticides, dinotefuran GR, imidacloprid GR and clothianidin GR at planting time of tomato. Residual analysis of foliage was carried out after periodic sampling the foliage and investigated the effects of exposed honeybee on the tomato foliage. The honeybee mortality by dinotefuran residues on the foliage was shown almost 100% at 7 days after treatment and decreased 17 days after treatment. The maximum mortality of honeybee by imidacloprid residues on the foliage was 44 ~ 72%. But the effect of pesticide lasted for 18 days and then decreased. The honeybee mortality by clothianidin residues on the foliage was 100% at 7 days after treatment and decreased 14 days after treatment. A tendency of the honeybee mortality and residue in foliage showed a similar character as time goes by. The residues in tomato foliage decreased gradually after 14 days by vigorous growth of tomatoes and the toxic effect of honeybee was significantly decreased after 21 days in actual usage of the treatment.

Effects of Organic Materials on Insect and Disease Occurrence and Fruit Quality in Pear Orchards (친환경 자재가 배 과원의 병해충 방제 효과 및 과실 품질 특성에 미치는 영향)

  • Choi, Hyun-Sug;Wu, Xiu-Yu;Kim, Wol-Soo;Lee, Youn;Choi, Byoung-Min;Kuk, Yong-In
    • Korean Journal of Organic Agriculture
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    • v.19 no.3
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    • pp.405-416
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    • 2011
  • Organic materials, such as chitin incubated solution (CIS) combined with neem oil (NO), nano silver silica (NSS), and Bordeaux mixture (BDM), were applied with and without agricultural chemicals (AC) (insecticide and fungicide) to investigate scab and mealybug occurrences and fruit qualities on 'Niitaka' pear trees in orchards in 2006. Fruits and leaves grown under CIS+NO without AC had less than 30%, scab occurrence, but CIS+NSS or CIS+BDM without AC had higher scab occurrence. Organic materials with AC decreased the scab to less than 20%. All treatments decreased mealybug occurrences to less than 10%, except for the fruits grown under CIS+BDM without AC. Fruit qualities varied among the treatments. Hunter value a, representing for the redness degree, was higher for fruits treated with CIS+NSS and CIS+BDM without AC than those with AC. Fruits treated with organic materials without AC had greater total phenolic and flavonoid compounds as well as antioxidant capacity in flesh and greater total phenolc compounds and antioxidant capacity in peel than those treated with the AC.

Residual characteristics and processing factors of azoxystrobin during eggplant and lettuce processing (가지와 상추의 가공 중 azoxystrobin의 잔류량 변화 및 가공계수)

  • Kim, Jeong-Ah;Seo, Jeong-A;Lee, Hye-Su;Im, Moo-Hyeog
    • Journal of Applied Biological Chemistry
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    • v.63 no.1
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    • pp.51-60
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    • 2020
  • This study was conducted to investigate changes in pesticide residues in eggplant and lettuce during washing and cooking processes after application with azoxystrobin. Eggplant was processed with running washing, steaming, and stir-frying, and lettuce was processed with soaking washing, running washing, soaking and running washing, ultrasonic cleaning, and blanching. The limit of quantitation of GC analysis of azoxystrobin was 0.01 mg/kg and the recovery rate was 84.7-109.5%. The azoxystrobin processing factors (PFs) and reduction rates in eggplant and lettuce were calculated and the results were as follows. In the case of eggplant, the azoxystrobin PF and reduction rate of running washing were 0.29 and 71.1%, respectively, those of steaming were 0.32 and 68.0%, respectively, and those of stir-frying were 0.24 and 75.7%, respectively. In the case of lettuce, the azoxystrobin PF and reduction rate of soaking washing were 0.25, 75.3%, those of running washing were 0.61 and 38.9%, respectively, those of soaking and running washing were 0.32, 68.0%, those of ultrasonic cleaning were 0.47 and 53.1%, respectively, and those of blanching were 0.26 and 73.6%, respectively. It could be identified that pesticide residues in eggplant and lettuce can be effectively reduced through washing and cooking processes and that most of pesticide residues were removed when cooking processes were undergone after washing. Therefore, azoxystrobin PFs after washing and processing can be provided as basic data for risk assessment.

환경변이원 및 항변이원에 관한 연구: 살균제 Captan 및 유기인계 살충제 (Diazinon, MEP, Malathion 및 EPN)의 혼합처리가 E. coli $WP_2 S$ (uvrA-, trp-) 균주의 돌연변이와 생잔율로 미치는 영향

  • 조봉금
    • Environmental Mutagens and Carcinogens
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    • v.9 no.2
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    • pp.97-109
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    • 1989
  • 살균제 Captan, 살충제 Diazinon, MEP, Malathion 및 EPN 의 단독 처리 그리고 Captan 반복처리와 이들 살충제와 서로 다른 조합으로의 동시적, 시간적 복합처리가 E. coli WP2S(uvrA-, trp-) 균주의 돌연변이유발 빈도 및 생잔율에 미치는 영향을 검토하여 다음과 같은 결과를 얻었다. 1. Captan, Diazinon, MEP, Malathion, EPN 및 UV 의 동시적 복합처리는 이들 농약의 단독 처리에서 보다 E. coli WP2S (uvrA-, trp-)균주의 돌연변이유발빈도가 높았고 이들 농약의 단독처리효과를 합한 가산적 영향으로 나타났으며, 동일조건하에서 이들 농약의 처리농도를 배로 늘렸을 때는 배가효과를 보였으나 이 균주의 증가된 돌연변이 유발빈도는 cinnamaldehyde 30ng 및 60ng/ml 그리고 tannic acid 50ng/ml 배지로 각각 첨가했을 때 감소되었고 생잔율은 증가되었다.

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Simulation of Chemigation Efficacy (관개방제의 효력예측을 위한 시뮬레이션)

  • 구영모;해롤드썸너;래리챈들러
    • Journal of Biosystems Engineering
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    • v.21 no.1
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    • pp.10-20
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    • 1996
  • 관개방제 기술의 변수 및 효력예측을 위한 컴퓨터 시뮬레이션 프로그램이 유화/산화액적의 부착율, 유충의 추계적 난보운동 및 무작위 농약흡수 이론을 이용하여 개발되었다. 시뮬레이션 결과는 밤나방 유충, Spodaptera frugiperda (J.E. Smith) (Lepidoptera : Noctuidae)을 이용한 방제효력 실험결과와 비교하였다. 이론치와 실험치는 서로 일치되었다. 방제율은 농약유효성분량이 증가함에 따라 증가하였으며 크로포(chlorpyrifos) 약제의 표준 권고량인 670g[AI]/ha에서 완전방제가 예상되었다. 유화액적(emulsion)은 상대적으로 직경이 큰 산화액적(dispersion) 보다 작물잎 표면에 부착이 어려워 낮은 방제율을 나타내었다. 액적직경이 방제효력에 미치는 영향은 목화작물에 대하여 낮은 약제량에서 뚜렷하게 나타났고, 그 영향은 약제량이 증가할수록 목화 및 옥수수 모두에서 저하되었다. 엽형계수는 작물의 엽상구조에 따른 액적의 부착 및 계류에 미치는 영향을 의미한다. 고찰된 관계방제기술의 영향요소에 대한 이해는 농약사용의 감소 및 효력의 증가에 중요한 역할을 한다.

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