• Title/Summary/Keyword: 약효지속효과

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Controlled Release of Oxyfluorfen from the Variously Complexed Formulations III. Phytotoxicity and Efficacy of Selected Formulations as Affected by Application Rates (수종(數種)의 結合齊l型(結合齊l型)으로부터 Oxyfluorfen의 방출제어연구(放出制御硏究) III. 사용량(使用量)에 따른 선발제형(選拔劑型) Oxyfluorfen의 약해(藥害)·약효평가(藥效評價))

  • Guh, J.O.;Lim, W.H.;Chon, S.U.;Kwon, S.L.
    • Korean Journal of Weed Science
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    • v.11 no.1
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    • pp.11-18
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    • 1991
  • Seven formulations of oxyfluorfen selected from the previous studies(4. 5) were tesed to evaluate crop injury and herbicidal efficacy on two rice cultivars and several annual and perennial weeds in a greenhouse. Each formulation at two different rates was applied to rice transplanted with 8-, 22- and 32-day old seedlings and to direct-seeded rice. Among the formulations, Elvan, Bentonite B. Chitosan and Coal Slag gave lower injury than a control formulation, Sand-coated oxyluorfen, and they did not have a problem with excessive release if active ingredient at once. Especially, the formulations of Elvan, Chitosan and Bentonite B controlled annual weeds (Echinochloa crus-galli, Monochoria vaginalis, Cyperus difformis., and Scirpus juncoides) and perennial weeds (Sagittaria pygmaea, and Cyperus serotinus). The surface structure of the formulations indicate the different possibilities of releasing of oxyfluorfen by different cracking and hole sizes, namely retention capacity.

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Physicochemical Characteristics and Efficacy of Controlled-release Insecticide Formulation (방출조절형(放出調節型) 살충성(殺蟲性) 농약제제(農藥製劑)의 특성(特性)과 약효(藥效)에 관한 연구(硏究))

  • Kim, Jin-Hwa;Oh, Byung-Youl;Oh, Kyeong-Seok;Kim, Sung-Kee;Kim, Mee-Hea;Kim, Young-Koo
    • Korean Journal of Environmental Agriculture
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    • v.14 no.3
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    • pp.289-295
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    • 1995
  • This study was carried out to develop a controlled-release insecticide formulation for the control of rose aphid (Macrosiphum ibarae) in rose and cotton aphid (Myzus persicae) in chrysanthemum (Dendranthema grandiflorum var. Meibung) in greenhouse. Imidacloprid[1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine] was chosen as a toxicant. Two synthetic polymers, low density polyethylene(LDPE) and ethylene vinyl acetate(EVA), were used as polymer matrices. The tested plastic sheet formulations were prepared by heat-aided extrusion procedures after mixing imidacloprid technical and the polymers of three different combinations, and physicochemical properties as well as efficacy of the formulations were investigated. The amounts of imidacloprid recovered and incorporated in the formulations were recorded over 90% and 80%, respectively. Release of the active ingredient from the formulations was remarkably affected by mixing rates of polymers. The active ingredient in the formulations was chemically unstable with over 10% degradation rates after 90 day storage at $50{\pm}2^{\circ}C$. The residual amounts of imidacloprid in the soil treated with the formulations were paralleled with the release pattern of the formulations. Efficacy of the formulations on rose and cotton aphid was maintained over 90% even 120days after treatment under greenhouse.

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The Effects of the Application Time of Buprofezin 25% WP on the Density of the Brown Planthopper(Nilaparvata lugens Stal) (Buprofezin 25% WP의 처리시기와 벼멸구(Nilaparvata lugens Stal) 밀도억제효과)

  • 배윤환;이준호;현재선
    • Korean journal of applied entomology
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    • v.31 no.4
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    • pp.551-559
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    • 1992
  • These studies were conducted to investigate the biological effects of buprofezin 25% WP on the adult of the brown planthopper (BPH) and its control effects on the BPH population, when buprofezin was treated on different days after the introduction of the BPH adult to the potted rice. Also age structures of the BPH population at the time of buprofezin treatment were observed. The results were as follows: Buprofezin (7.0 g a.i./l0 a) could reduce the longevity and fecundity of the newly emerged female but did not affect the biology of older female, and it did not affect the biology of the male. The larval densities at the time of buprofezin treatment was reduced to nearly zero after treatment. The higher the residual effect and the proportion of larvae at the time of buprofezin treatment were, the higher its con¬trol effect on the BPH population was. In case of buprofezin 7.0 g a.i./l0a treatment, the time interval of treatment that could show the highest control effect was about 10 days (from 18 days after the adult introduction to the adult emergence days of next generation).

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Efficacy and phytotoxicity of a petroleum spray oil for control of citrus red mite in Jeju island (제주지역에서 귤응애에 대한 Petroleum Spray Oil의 방제효과 및 식물독성)

  • Kim, Dong-Whan;Kim, Kwang-Sik;Hyun, Jae-Uk;Kang, Si-Yong;Song, Jeong-Hueb;Riu, Key-Zung
    • The Korean Journal of Pesticide Science
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    • v.4 no.4
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    • pp.87-92
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    • 2000
  • Recently, a new developed petroleiun spray oil(PSO; D-C Tron $Plus^{(R)}$) has been used to control key pests in integrated pest management (IPM) system of citrus orchards in Australia. The efficacy and phytotoxicity of the PSO against the citrus red mite (Panonychus citri) were compared with conventional pesticides (e.g.Tebufenpyrad, Bifenazate and Sun spray oil) in field condition in Jeju. And under PSO mixing spray with some fungicides, the occurrence of phytotoxic symptoms on citrus leaf was investigated. All concentrations of PSO spraying (0.25%, 0.33%, 0.5% and 1.0%) were significantly suppressed the citrus red mite to similar levels of other conventional pesticides. And the spraying of PSO levels ${\geq}0.5%$ was induced not only occurrence of some oil-sucked symptoms on leaf, but also increase of the dropping leaf and fruit rates. As results from mixing PSO spraying test with other fungicides, little burning on new flush shoot was founded only in PSO 1% plus Fluazinam treatment. From the results of this study, with the consideration of pesticidal efficacy and phytotoxicity, 0.25% and 0.33% PSO spraying level will be recommended for the control of citrus red mite during summer season in Jeju.

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Persistence of Chlorfenapyr in Paprika Leaf and Its Residual Biological Activity to Two Spotted Spider Mite, Tetranychus urticae (파프리카 잎 중 Chlorfenapyr의 잔류량 변화와 점박이응애에 대한 잔효 생물 활성)

  • Cho, Kyu-Song;Lee, So-Jung;Lee, Dong-Yeol;Kim, Yeong-Jin;Kim, Kyoung-Youl;Chung, Bu-Keun;Kang, Kyu-Young
    • The Korean Journal of Pesticide Science
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    • v.15 no.3
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    • pp.317-322
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    • 2011
  • A comparative experiment was conducted to investigate the persistence of chlorfenapyr residue and its biological activity to two spotted spider mite, Tetranychus urticae, after treatment of chlorfenapyr suspension concentrate (10% SC) on paprika plants at recommended (2000 times dilution) and double dosage. Biological half-lives of chlorpfenapyr were estimated as 8 and 5 days in leaves and fruits of paprika plants, respectively. While initial deposits of chlorfenapyr residues in leaves at recommended and double dosages were 22.22 and 37.75 ${\mu}g\;g^{-1}$ at the time of application, its residue decreased to 1.56 ${\mu}g\;g^{-1}$ and 3.62 ${\mu}g\;g^{-1}$ at 29 days after treatment, respectively. Residual biological activity of chlorfenapyr SC to T. urticae at recommended dosage lasted for 7 or 15 days on the basis of 24 or 48-hrs mortality test assayed with feeding on excised leaf chlorfenapyr-treated. The control efficacy to the mite showed a good agreement with the persistence of chlorfenapyr residues in leaves.

Effects of RH 5849, an Ecdysone Agonist, against Feeding and Growth of Tobacco Cutworm(spodoptera litura Fabricius)Larvae (담배거세미나방(Spodoptera litura Fabricius) 유충의 섭식과 생장에 대한 곤충탈피호르몬길항제 RH 5849의 영향)

  • 박노중;장경수;조점래;조광연
    • Korean journal of applied entomology
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    • v.31 no.4
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    • pp.475-479
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    • 1992
  • The non-steroidal ecdysone agonist RH 5849 showed almost similar LC.o values( 18.1-26.5 ppm) at all stages of larval development of the tobacco cutworm, Spodoptera litura, when treated by a leaf-disk dipping method. The feeding-inhibition rate for the 4th instar larvae was dose-dependent, and simultaneously the weight gain of 3rd instar larvae ceased within 48 hour after feeding of the cabbage leafdisk dipped into RH 5849 4.2 ppm solution. The systemic larvicidal effect of RH 5849 was compared at cabbage and tobacco whole plant test. The $LC_{50}$ values below 20 ppm(mg/kg soil) was lasted for 15 days in cabbage, 30 days in tobacco respectively.

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Efficacy of Some Insecticides against Ectinohoplia rufipes (Coleoptera: Scarabaeidae) on Different Host Plant Species (기주 식물에 따른 몇 가지 살충제의 주황긴다리풍뎅이, Ectinohoplia rufipes(Coleoptera: Scarabaeidae)에 대한 살충효과)

  • 최우근;이동운;이승욱;추호렬;박정규;사공영보
    • Asian Journal of Turfgrass Science
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    • v.15 no.3
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    • pp.119-126
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    • 2001
  • The susceptibility of Ectinohoplia rufipes, insect pest of landscaping trees in golf courses to registered insecticides in golf courses was investigated. In addition, effect of host plants, Ainus firma, Prunus serrulata var. spontanae, and Osmantus asiaticus on susceptibility of E. rufipes were tested in laboratory with efficacy of some insecticides in laboratory and fields. The insecticides used in experiments were cabaryl 40%+phosalone 20% WP, chlorpyrifos-methyl 25% EC, chlorpyrifos 20% + diflubenzuron 7% n, deltamethrin 1% EC, ethopenprox 8% +diazinon 25% WP, and fenitrothion 50% EC. Mortalities of E.rufipes were 100% except chlorpyrifos-methyl. when A. firma leaves dipped in recommended concentration of given insecticides were supplied as food to adult of E. rufipes. LC$_{50}$s of insecticides were different depending on host plants, that is, those of deltamethrin were 0.21 ppm in Ο. asiaticus, 0.45 ppm in P. serrulata var. spontanae, and 0.77 ppm in A. firma. LC$_{50}$s of fenitrothion were 24.1 ppm, 64.0 ppm, and 11.0 ppm and those of chlorpyrifos-methyl were 97.2 ppm, 40.6 ppm, and 29.6 ppm, respectively. LC$_{50}$ was the lowest in Ο. asiaticus and that of chlorpyrifos-methyl and fenitrothion was the lowest in A. firma. Deltamethrin was the most effective against adult of E. rufipes in field like in laboratory and persisted in two weeks.weeks.

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Studies on Algae Control in Wetted Nursery of Rice (수도 수묘대의 조류방제에 관한 연구)

  • Kim Kyu Chin;Ham Young Soo
    • Korean journal of applied entomology
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    • v.15 no.3 s.28
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    • pp.127-132
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    • 1976
  • This experiment was conducted to several agricultural chemicals such as cuperic sulfate, lime sulfur, swep 80 wp, dithane A-40 and dichlone 50 wp for use as algaecide in wetted nursery of rice, and chemicals were applied at 5 day before and after sowing. The results are summarized as follows. 1. It was found that the effective chemicals as algaecide in wetted nursery were dichlone 50 wp and swop 80 wp, but chemical damage appeared to plant when dithane A-40 and swep 80 wp was applied. 2. Cuperic sulfate was identified to control algae, but it seems to be injurious to seed germination when applied in wetbed nursery. 3. Results were revealed that except dichlone, 50 cuperic sulfate, lime sulfate, swep 80 wp and dithance A-40 decreased the number of roots, rate of dry matter production and plant height compared when no chemical was applied. 4. Dichlone 50 wp was recognized as the most suitable algaecide in view of the plant growth and algae control in wetbed nursery.

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Effect on Egg Hatch Inhibition of Benzoylphenylureas Treated to Different Aged House Fly, Musca Domestica L. (발육시기가 다른 집파리 성충에 처리한 BPUs계 살충제의 알에 대한 부화억제 효과)

  • 박정규;강창헌;김경옥;강창훈
    • Korean journal of applied entomology
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    • v.39 no.2
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    • pp.117-122
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    • 2000
  • The chemosterilizing effects of 4 benzoylphenylureas (BPUs), were tested on the adult house fly at different developmental stages. The male and female flies before insemination (I-day-old) or with fully developed ovaries (5-day-old) were exposed to the flask surface coated with BPUs solution (300 ppm) for 24 hrs. None of the eggs layed by the 5-day-old flies on the next day of exposure to either flufenoxuron or teflubenzuron hatched to larvae. The eggs layed by the 5-day-old flies exposed to either triflumuron or diflubenzuron also showed a significantly reduced hatchability of 23%. The first egg batches layed by 1-day-old flies exposed to flufenoxuron showed hatchability of only 1%. These results indicate that the BPUs applied were effective in egg sterilization irrespective of developmental stage of house fly. The effect of flufenoxuron was the most pronounced and lasted for 5 days after exposure.

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Selection of Systemic Chemicals and Attractiveness of Sunflower to Ricania spp.(Hemiptera: Ricaniidae) Adults (갈색날개매미충 성충에 대한 해바라기의 유인력과 침투이행성 약제 선발)

  • Choi, Yong-Seok;Seo, Hwa-Young;Jo, Shin-Hyuk;Whang, In-Su;Park, Deog-Kee
    • Korean journal of applied entomology
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    • v.56 no.4
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    • pp.345-350
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    • 2017
  • Sunflower, selected as a trap plant that can be controlled by attracting Ricania spp. adults via attraction has the highest attractiveness during the preoviposition period. Considering the ecological characteristics of Ricania spp., adults are distinguished by the preoviposition and oviposition periods and the attractiveness of sunflower to Ricania spp. adults was 91.4~95.2% higher than that of blueberry during the preoviposition period. On August 20, when Ricania spp. adults entered the oviposition season, sunflower attractiveness was low at 9.8~11.6% owing to preference for tree species. Based on the result of the selection of systemic chemicals that could be used concomitantly with sunflower, all chemicals, except etofenprox, showed a high controlling effect of over 90%, and among them, dinotefuran showed the highest insecticidal rate of 95.8%. The systemic chemicals acetamiprid, dinotefuran, thiamethoxam, and imidacloprid persisted for 13 days (survey period). Therefore, the concomitant use of sunflower and systemic chemicals can reduce the density of Ricania spp. entering farmlands and their populations in surrounding habitats, which are expected to help in stabilizing the ecosystem.