• Title, Summary, Keyword: triforine

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Effect of Photosensitization on the Diminution of Pesticide Residues on Red Pepper (고추중 잔류농약의 경감에 미치는 감광작용의 효과)

  • Lee, Jae-Koo;Kwon, Jeong-Wook;Ahn, Ki-Chang;Park, Ju-hyoung;Lee, Jun-Su
    • Korean Journal of Environmental Agriculture
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    • v.19 no.2
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    • pp.116-121
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    • 2000
  • Photosensitizing activities of some selected photosensitizers (PS) on the artificial diminution of pesticide residues on red pepper were investigated. Red peppers were sprayed 4 times with the three fungicides, dithianon, triflumizole, and triforine, according to the conventional method, followed by the application of photosensitizers once. Recoveries for the analyses of the pesticide residues were high $(90.7{\sim}98.5%)$ except for dithianon $(76.6{\sim}78.3%)$. In case of dithianon, after 1 day of the application of PS-1 (10 ppm), the residual amount was 76% of that of the control. For triflumizole, the residual amount after 3 days of the application of PS-4 (50 ppm) accounted for 48% of that of the control. In case of triforine, the residual amount after 1 day of the application of PS-3 (100 ppm) was 55% of that of the control. The results indicated that the photosensitizing activities of photosensitizers varied with chemicals and the matrices where pesticide residues are remaining.

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Chemical Control of Powdery Mildew of Sweet Pumpkin in Korea (단호박 흰가루병의 약제방제)

  • 장석원;김성기;김희동
    • Research in Plant Disease
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    • v.7 no.1
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    • pp.31-36
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    • 2001
  • To establish an effective chemical control strategy against powder mildew of sweet pumpkin (Cucurbita maxima Duchesne) caused by Sphaertheca fuliginea, screening of effective fungicides and determination of their application times were conducted. Powdery mildew caused by S. fuliginea began to occur at about 80 days after transplanting and continuously increased until harvesting in Korea. Systemic fungicides, such as difenoconazole, triforine, bitertanol, and triflumizole, were effective for controlling powdery mildew, showing control efficacies of about 80-90%. When the fungicide triflumizole was applied 3 or 4 times from the beginning day of the disease at 10-day intervals, about 92.0% and 94.6% of disease control and yield increase of 7% and 9% were obtained, respectively. Therefore, the proper application of triflumizole for controlling powdery mildew of sweet pumpkin must be done more than 3 times.

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Processing and Reduction Factors of Pesticide Residues in Chinese Matrimony Vine and Jujube by Drying (구기자와 대추 중 잔류농약의 건조에 따른 가공계수 및 감소계수)

  • Lee, Eun-Young;Noh, Hyun-Ho;Park, Young-Soon;Kang, Kyung-Won;Lee, Kwang-Hyen;Park, Hyo-Kyung;Kwon, Chan-Hyeok;Im, Moo-Hyeog;Kyung, Kee-Sung
    • The Korean Journal of Pesticide Science
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    • v.13 no.3
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    • pp.159-164
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    • 2009
  • This study was carried out to elucidate changes in concentration of pesticide residues in Chinese matrimony vine and jujube during drying. Test pesticides, triadimefon and triforine for chinese matrimony vine and methoxyfenozide and thiacloprid for jujube, which are commonly used for the crops in Korea, were treated to the crops by spraying and dipping. The pesticide residues in both fresh and dried Chinese matrimony vine and jujube were analyzed by using a GLC-ECD and an HPLC-DAD. Processing factors of the pesticides in Chinese matrimony vine and jujube by drying ranged from 1.41 to 2.28 and from 1.50 to 4.20, respectively. And reduction factors of the pesticides in the crops ranged from 0.29 to 0.47 and from 0.68 to 0.98, respectively. These results indicate that concentrations of the pesticides in the test crops increased after drying, while amounts of pesticides in them were diminished by drying.

Controlling effect of several surfactants on barley powdery mildew caused by Erysiphae graminis (보리 흰가루병에 대한 몇 가지 계면활성제의 방제 효과)

  • Jang, Kyung-Soo;Yoo, Joo-Hyeon;Choi, Gyung-Ja;Kim, Jin-Cheol;Cho, Kwang-Yun;Kim, Heung-Tae
    • The Korean Journal of Pesticide Science
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    • v.5 no.2
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    • pp.51-57
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    • 2001
  • Controlling effect of several surfactants on barley powdery mildew (pathogen : Erysiphae graminis) and those influence on fungicidal activity by tank-mixing with commercialized fungicides were investigated in greenhouse test with barley seedlings. While protective activity of PNPP showed 90% at $1,000{\mu}g/mL$, that of LN 13.0 91.2%, tile best among 8 surfactants used in curative test. With $500{\mu}g/mL$, LN 13.0 showed 4% of disease percentage on the first leaf of narley continuously 4 days after the curative application. Excent for PNPP, the other surfactants, including NP 13.0, LN 13.0, and PAS, showed good inhibitory activity against spore germination in water agar medium amended with those surfactants. PAS, which showed very poor effect against barley powdery mildew in greenhouse test, strongly inhibited spore germination. Fungicide of triadimefon and triforine showed no controlling activity against Erysiphae graminis in narley seedlings, but they highly controlled powdery mildew in case of addition with $500{\mu}g/mL$ of LN 13.0 and Tween 20. SP 13.0, NP 13.0, LN 13.0 and DBC showed severe phytotoxicity in first leaf of barley seedlings, but Tween 20, SLIS, PAS, and PNPP not at $1,000{\mu}g/mL$.

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Mutagenicity of Pesticides in the Salmonella System (Salmonella System에 있어서의 농약의 돌연변이 유발성)

  • 백형석;변우현;전문진;이세영
    • Microbiology and Biotechnology Letters
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    • v.5 no.4
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    • pp.159-165
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    • 1977
  • 20 pesticides induding 11 insecticides, 5 herbicides and 4 fungicides have been tested for mutagenic activity in the Salmonella microsome system. It was found that Captan showed strong mutagenic activity directly in TA 1535, TA 100 and TA 98 strains, indicating that it induces both base substitution and frame shift mutation. With microsomal activation system, mutagenicity of Captan was slightly decreased. Micut, Dimethoate and Triforine revealed slight mutagenicity in TA100 without microsmal enzyme activtion.

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Optimized Washing Method for Performance Improvement of a Washing Machine for Boxthorn Berries (구기자 세척기의 세척성능 향상을 위한 최적 세척방법 구명)

  • Kim, Woong;Lee, Seung-Kee;Jo, Hee-Jae;Han, Jae Woong
    • The Korean Journal of Community Living Science
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    • v.24 no.2
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    • pp.187-194
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    • 2013
  • The purpose of this study was to define the optimal boxthorn berries washing method for developing the boxthorn berries cleaner. We analyzed the rate of removal of residual pesticides according to washing methods; 1st - habitual washing method, 2nd - drum rotation washing method, 3th - drum rotation and air bubble washing method, 4th - drum rotation and nozzle spray washing method, 5th - drum rotation and air bubble and nozzle spray washing method. A rate of removal of residual pesticides of 88% was detected in the drum rotation and air bubble and nozzle spray washing method, and a rate of 82% was detected in the habitual washing method. The drum rotation and air bubble and nozzle spray washing method appeared to be the best good washing effect compared to the habitual washing method(about 6% compared to 82.0% higher). Clothianidin Triadimefon, Triforine ingredients, the drum rotation and air bubble and nozzle spray washing method efficiency was lower compared to the habitual washing method removal efficiency.

Selection of Effective Fungicides Against Xylogone sphaerospora, a Fungal Pathogen of Cultivated Mushroom, Ganoderma lucidum (영지 노랑병 방제에 효과적인 살균제의 선발)

  • 최경자;이종규;우성희;조광연
    • Korean Journal Plant Pathology
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    • v.14 no.5
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    • pp.491-495
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    • 1998
  • A fungal disease of the cultivated mushroom, Ganoderma lucidum, caused by Xylogone sphaerospora was epidemic throughout all cultivation areas in Korea which caused a lot of yield losses in the mushroom production. For controlling the disease, the screening of effective fungicides against the pathogenic fungus were conducted. Thirty seven commercially available fungicides were tested for their inhibitory activities on potato dextrose agar media supplemented with these fungicides at various concentrations. Twenty one fungicides significantly inhibited mycelial growth of the pathogen, Xylogone sphaerospora, but 16 fungicides had no inhibitory effect. Among these 21 fungicides, 17 fungicides also inhibited mycelial growth of Ganoderma lucidum as well, but imazalil, procymidone, triforine, and vinclozolin had no inhibitory effects. However, vinclozolin showed no inhibitory effect on mycelial growth of the mushroom even at the concentration of 50 $\mu\textrm{g}$/ml vinclozolin solution for 2 hours, and then the pathogen was inoculated. After two month-cultivation of the mushroom, over 90% of logs treated with vinclozolin without pathogen inoculation produced fruiting bodies. However, fruiting bodies were not produced form the logs inoculated with the pathogen, but not treated with vinclozolin. Fifty seven percent of logs. which were pre-treated with vinclozolin and then inoculated with the pathogen produced fruiting bodies. Based on the results, vinclozolin is effective for the control of yellow disease of the Ganoderma lucidum caused by Xylogone sphaerospora.

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