• 제목/요약/키워드: Insect screen

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Effects of Insect Screen Net on Insect Pest Control for Jujube (방충망에 의한 대추 해충 방제 효과)

  • Lee, Seong-Kyun;Lee, Kyeong-Hee;Oh, Ha-Kyung;Lee, Jong-Won;Kim, Chung-Woo;Kang, Hyo-Jung;Kim, Sang-Hee
    • Korean Journal of Organic Agriculture
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    • v.25 no.3
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    • pp.619-630
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    • 2017
  • In recent years, not only the cultivation area of Jujube in Korea but also the number of pest species has increased. The farmers farming environmentally friendly are in great difficulty because there are no effective control devices. This study was conducted to investigate the control effect of the insect screen net on three pest species (Apolygus spinolae, Dasineura sp. and Carposina sasakii) in Jujube orchard when the pests were blocked by insect screen net. For the first and second surveys, the damage rates by A. spinolae were 9.06, 13.95% in 50 mesh, 4.75, 10.17% in 25 mesh, 5.68, 11.84% in 18mesh mesh of insect screen net and 21.6, 36.34% in untreated insect screen net, respectively. The damage rates by Dasineura sp. were 0.54, 0.13% in 50 mesh, 0.93, 2.84% in 25 mesh, 1.05, 13.45% in 18 mesh mesh of insect screen net and 11.1, 26.65% in untreated insect screen net. Carposina sasakii were completely blocked in all the treatments. Damages on Jujube were not observed by insect screen net. Therefore, insect screen net is effective on insect pest control for Jujube.

Colors and Sizes of Insect Screen Net Influence Physical Control of Bemisia tabaci and Frankliniella occidentalis under Controlled Environments (환경제어 조건에서 방충망 색과 크기가 담배가루이 및 꽃노랑총채벌레의 물리적 방제에 미치는 영향)

  • Jung, Chung-Ryul;Yoon, Jung-Beom;Kim, Kwang-Ho;Lee, Guang-Jae;Heo, Jeong-Wook;Kim, Hyun-Hwan
    • Korean Journal of Environmental Agriculture
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    • v.35 no.1
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    • pp.46-54
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    • 2016
  • BACKGROUND: The tobacco whitefly(Bemisia tabaci Gennadius) and western flower thrips(Frankliniella occidentalis Pergande) seriously damaged to several greenhouse crops and transmitted plant viruses such as the Tomato Yellow Leaf Curl Virus(TYLCV) and Tomato Spotted Wilt Virus(TSWV). Objective of this study was to elucidate exclusion effects of insect screen nets by various hole sizes and colors for control of the two insect pests in controlled environments such as a closed plant production system.METHODS AND RESULTS: The exclusion effects to various hole sizes of three other colors with 30 individuals of two insect pests was evaluated. B. tabaci was not showed not difference to different colors and sizes. F. occidentalis showed that 0.2 mm black screen was the most effective exclusion than other colors of 0.6 and 0.8 mm.CONCLUSION: The two insects were different reponses to various hole sizes of white and other color screen nets. It was proved that the 0.4 mm white screen net used in this experimental condition was suitable for exclusion of B. tabaci and 0.2 mm black forF. occidentalis.

A Study on Micro-insect Screens Using Coffee Grounds (커피찌꺼기를 활용한 미세방충망 연구)

  • Yu Kyung Lee;Gyuri Kim;Min Ji Woo;Ga In Cho;Donghyeon Lee;Mantae Kim;Dong-Jun Kwon
    • Composites Research
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    • v.37 no.4
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    • pp.363-368
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    • 2024
  • Due to the increase in coffee consumption, the amount of coffee grounds is also increasing, which leads to environmental problems. In order to solve these problems, this study proposes the utilisation of coffee grounds. In particular, the porous structure of coffee grounds was utilised to optimise a micro insect screen for filtering fine dust. To realize the porous structure of coffee grounds, a polar/non-polar separation method using KOH and n-hexane was applied to obtain coffee grounds with increased porosity. In addition, the composition of an eco-friendly adhesive was identified to fix the coffee grounds to the screen, and the conditions for homogeneous adhesion of the coffee grounds to the screen were optimised. As a result, we confirmed the effect of the number of coatings of coffee grounds on the filtering effect of fine dust, and found that two coatings of coffee grounds increased the filtering.

Study on Fabric and Embroidery of Possessed by Dong-A University Museum (동아대학교박물관 소장 <초충도수병>의 직물과 자수 연구)

  • Sim, Yeon-ok
    • Korean Journal of Heritage: History & Science
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    • v.46 no.3
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    • pp.230-250
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    • 2013
  • possessed by Dong-A University Museum is designated as Treasure No. 595, and has been known for a more exquisite, delicate and realistic expression and a colorful three-dimensional structure compared to the 'grass and insect painting' work and its value in art history. However, it has not been analyzed and studied in fabric craft despite it being an embroidered work. This study used scientific devices to examine and analyze the Screen's fabric, thread colors, and embroidery techniques to clarify its patterns and fabric craft characteristics for its value in the history of fabric craft. As a result, consists of eight sides and its subject matters and composition are similar to those of the general paintings of grass and insects. The patterns on each side of the 'grass and insect painting' include cucumber, cockscomb, day lily, balsam pear, gillyflower, watermelon, eggplant, and chrysanthemums from the first side. Among these flowers, the balsam pear is a special material not found in the existing paintings of grass and insect. The eighth side only has the chrysanthemums with no insects and reptiles, making it different from the typical forms of the paintings of grass and insect. The fabric of the Screen uses black that is not seen in other decorative embroideries to emphasize and maximize various colors of threads. The fabric used the weave structure of 5-end satin called Gong Dan [non-patterned satin]. The threads used extremely slightly twisted threads that are incidentally twisted. Some threads use one color, while other threads use two or mixed colors in combination for three-dimensional expressions. Because the threads are severely deterioration and faded, it is impossible to know the original colors, but the most frequently used colors are yellow to green and other colors remaining relatively prominently are blue, grown, and violet. The colors of day lily, gillyflower, and strawberries are currently remaining as reddish yellow, but it is anticipated that they were originally orange and red considering the existing paintings of grass and insects. The embroidery technique was mostly surface satin stitch to fill the surfaces. This shows the traditional women's wisdom to reduce the waste of color threads. Satin stitch is a relatively simple embroidery technique for decorating a surface, but it uses various color threads and divides the surfaces for combined vertical, horizontal, and diagonal stitches or for the combination of long and short stitches for various textures and the sense of volume. The bodies of insects use the combination of buttonhole stitch, outline stitch, and satin stitch for three-dimensional expressions, but the use of buttonhole stitch is particularly noticeable. In addition to that, decorative stitches were used to give volume to the leaves and surface pine needle stitches were done on the scouring rush to add more realistic texture. Decorative stitches were added on top of gillyflower, strawberries, and cucumbers for a more delicate touch. is valuable in the history of paintings and art and bears great importance in the history of Korean embroidery as it uses outstanding technique and colors of Korea to express the Shin Sa-im-dang's 'Grass and Insect Painting'.

Gene Manipulation of Pin 2(Proteinase Inhibitor II) to the Cottonwood Leaf Beetle(Coleoptera : Chrysomelidae) in Transgenic Poplar(Populus deltodies × P. nigra) (형질전환(形質轉換)된 포플러의 딱정벌레에 대한 저항성(抵抗性) 유전자(遺傳子)(Proteinase Inhibitor II) 발현(發現))

  • Kang, Hoduck
    • Journal of Korean Society of Forest Science
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    • v.86 no.4
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    • pp.407-414
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    • 1997
  • The resistance of a non-transgenic poplar clone, 'Ogy' and three transgenic poplar lines to the cottonwood leaf beetle, Chrysomela scripta F., was evaluated by in vitro feeding. The lines were transformed with neomycin phosphotransferase II(NPT II) as a selectable marker, proteinase inhibitor II(pin2) as a resistance gene, and CaMV 35S as a promoter. An efficient method of sterilizing the beetle eggs and introducing them into plant tissue cultures was developed. The resistance of the transgenic lines was investigated in terms of effects tin leaf area consumed, insect weight, insect developmental stages, and plantlet root dry weight after feeding. Also, leaf area consumed was examined by leaf age as measured through leaf plastochron index(LPI). The leaf area consumed and insect weight were highly significant between transformants and control, and insect development in vitro was significant among the transgenic lines. Larval infestation was the most severe around LPI 4 to 5 which were young leaves. The system provided a quick, highly controlled method to screen developing transgenic plantlets directly.

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Mass Spectrometry-Based Screening Platform Reveals Orco Interactome in Drosophila melanogaster

  • Yu, Kate E.;Kim, Do-Hyoung;Kim, Yong-In;Jones, Walton D.;Lee, J. Eugene
    • Molecules and Cells
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    • v.41 no.2
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    • pp.150-159
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    • 2018
  • Animals use their odorant receptors to receive chemical information from the environment. Insect odorant receptors differ from the G protein-coupled odorant receptors in vertebrates and nematodes, and very little is known about their protein-protein interactions. Here, we introduce a mass spectrometric platform designed for the large-scale analysis of insect odorant receptor protein-protein interactions. Using this platform, we obtained the first Orco interactome from Drosophila melanogaster. From a total of 1,186 identified proteins, we narrowed the interaction candidates to 226, of which only two-thirds have been named. These candidates include the known olfactory proteins Or92a and Obp51a. Around 90% of the proteins having published names likely function inside the cell, and nearly half of these intracellular proteins are associated with the endomembrane system. In a basic loss-of-function electrophysiological screen, we found that the disruption of eight (i.e., Rab5, CG32795, Mpcp, Tom70, Vir-1, CG30427, Eaat1, and CG2781) of 28 randomly selected candidates affects olfactory responses in vivo. Thus, because this Orco interactome includes physiologically meaningful candidates, we anticipate that our platform will help guide further research on the molecular mechanisms of the insect odorant receptor family.

Repellency of Herb Plants and Essential Oils Against the Green Peach Aphid, Myzus persicae (허브류 식물과 정유의 복숭아혹진딧물에 대한 기피 효과)

  • 김기황;정훈채
    • Journal of the Korean Society of Tobacco Science
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    • v.25 no.1
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    • pp.7-11
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    • 2003
  • Repellencies of herb plants and essential oils against alate Myzus persicae were investigated in a insect cage, a screen house, and a tobacco field. Numbers of nymphs deposited by alate or apterous Myzur persicae were lower on rosemary(Rosmarinus officinalis), silver thyme (Thymus vulgaris), and lemon balm(Melissa of fcianazis). Rosemary and silver thyme show little repellency against alate Myzus persicae on a nearby tobacco plant Rosemary oil, peppermint (Mentha piperita) oil, and ginger oil showed repellency against alate Myzus persicae, but spearmint (Mentha spicata) oil and lavender oil showed little repellency in a screen house. Rosemary oil, ginger oil, peppermint oil, lavender oil, and spearmint oil showed repellency against alate Myzus persicae in a tobacco field, but there was no significant difference among oils.

Current Status of Cashew Leaf and Nut Blight Disease (Cryptosporiopsis spp.) and Screening of Elite Cashew Hybrids Developed in 1996 and 1998 against the Disease in Eastern and Southern Tanzania

  • Majune, Dadili Japhet;Masawe, Peter Albert;Mbega, Ernest Rashid
    • Research in Plant Disease
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    • v.24 no.4
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    • pp.265-275
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    • 2018
  • Cashew (Anacardium occidentale L.) is an export crop and source of income in Tanzania. However, its productivity is challenged by insect pests and diseases. Cashew Leaf and Nut Blight Disease (CLNBD) caused by Cryptosporipsis spp. has been cited as one of the most devastating diseases in Tanzania. Studies were conducted to investigate incidences and severities of CLNBD on cashew in farmers' fields and elite cashew hybrids developed in 1996 and 1998 in eastern and southern zones of Tanzania. Furthermore, a screen house experiment was conducted to screen these hybrids against CLNBD at Naliendele Agricultural Research Institute (NARI), Mtwara, Tanzania. The results indicated significant differences (P<0.001) in CLNBD incidences and severities in cashew in farmers' fields across Bagamoyo, Nachingwea and Mtwara districts. Further, there were significant differences (P<0.001) among hybrids in CLNBD severities in the screen house experiment. In ranking the elite cashew hybrids, 38 were tolerant and 14 were susceptible to CLNBD. This observation suggests that elite cashew hybrids developed in 1996 and 1998 are more tolerant to CLNBD compared to cashew found in farmers' fields. These findings strongly suggest that the elite cashew hybrids can be recommended for commercial farming in Tanzania.

Control Efficacy of Fungicide Injection on Oak Wilt in the Field (살균제 나무주사를 이용한 참나무 시들음병 방제 효과)

  • Son, Su-Yeon;Seo, Sang-Tae;Park, Ji-Hyun
    • Research in Plant Disease
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    • v.20 no.4
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    • pp.295-298
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    • 2014
  • Oak wilt caused by Raffaelea quercus-mongolicae was first noticed in South Korea in 2004 and, ever since, its distribution and damage have been increasing. To screen a fungicide effective for oak wilt control by tree injection, laboratory and field experiments were conducted. Ten fungicides and one antibiotic were examined in vivo for their effectiveness in restricting the growth of R. quercus-mongolicae and R. quercivora (Japanese oak wilt pathogen) isolates. To the Korean isolates of R. quercus-mongolicae, chlorothalonil showed the highest fungicidal effects, followed by benomyl and propiconazole. To the Japanese one, propiconazole was highest in the fungicidal effectiveness, followed by benomyl and bitertanol. Propiconazole was selected for field-testing of its control efficacy because it showed good fungicidal effects in vitro and systemic activity. The control efficacy in the field was 87.5% in the first year of injection and 66.7% in the second year, indicating the fungicidal effects last at least over one year.