Spatial analysis of Conogethes punctiferalis (Lepidoptera : Crambidae) in the chestnut and walnut complex producing area

Kyusoon Kim,Sunghoon Baek,Min-Jung Kim,Young-gyun Park,Sanghyun Koh,Chansik Jung,Joon-Ho Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10

밤과 호두는 중요한 임산 자원으로써 최근 복숭아명나방의 피해가 증가하여 재배자들이 경제적 피해를 호소하고 있다. 부여군에 위치한 밤과 호두가 서로 인접한 재배지역의 밤나무와 호두나무 116그루를 무작위로 선정하고 각 나무별로 2개의 가지를 선정하여 복숭아명 나방의 피해율을 2018년 6월부터 9월까지 총 4회 조사하였다. 그 결과 6월, 7월, 8월의 복숭아명나방 피해과는 통계적으로(p<0.05) 호두재배지역에 집중 분포를 보였으며, 9월의 경우는 임의 분포하였다. 6월부터 8월까지는 호두 재배지역에서만 복숭아명나방의 피해가 나타나 조사지역에서 복숭아명나방 피해는 양의 상관관계를 보였다(p<0.025). 그러나 9월은 밤 재배지역에서 복숭아명나방 피해가 발생하고 호두 지역에서는 새로운 피해가 나타나지 않아 통계적으로 8월 이전과는 공간적 상호관계가 없는 것으로 나타났다(0.025<p<0.975). 이러한 결과로 월동세대는 호두에서 산란하여 피해를 야기하고 이후에 발생하는 세대는 밤에서 피해를 야기할 것으로 추정된다.

Spatial analysis of Conogethes punctiferalis (Lepidoptera : Crambidae) in the chestnut and walnut complex producing area

Kyusoon Kim,Sunghoon Baek,Min-Jung Kim,Young-gyun Park,Sanghyun Koh,Chansik Jung,Joon-Ho Lee 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10

Simultaneous mating disruption of two <i>Grapholita</i> species in apple orchards

Kim, Kyusoon,Park, Changgyu,Kim, Yonggyun 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.2 No.1

<P><B>Abstract</B></P> <P>Two <I>Grapholita</I> species (<I>G. molesta</I> and <I>G. dimorpha</I>) cause serious losses in apple production by means of direct fruit damage and destruction. These two congeners occurred at similar seasons in the same orchards. Furthermore, the two species occurred in similar population sizes in apple orchards, though <I>G. molesta</I> occurred much more in total occurrence density than did <I>G. dimorpha</I> in a pear orchard. The two species share two major sex pheromone components, (<I>Z</I>)-8-dodecenyl acetate (<I>Z</I>8-12:Ac) and (<I>E</I>)-8-dodecenyl acetate (<I>E</I>8-12:Ac), but differ with regard to the relative mixture ratio necessary to create conditions of maximal attraction. To develop a simultaneous mating disruption (SMD), a mass ratio of 95:5 of <I>Z</I>8-12:Ac and <I>E</I>8-12:Ac was selected due to its high cross-calling activity and subsequent high mating disruption against both species. When the mixture was applied to orchards, it resulted in significant mating disruption against both species. However, mating disruption efficacy was slightly higher in <I>G. dimorpha</I> than in <I>G. molesta</I>. Application dose and dispenser type affected efficacy duration of SMD. In addition, the high density occurrence of <I>G. molesta</I> significantly reduced the SMD efficacy. Using a wax-type of dispenser, an application of SMD in 100 g per hectare dispersed in early spring recorded >90% mating disruption efficacy through the entire growing season against both <I>Grapholita</I> species.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two <I>Grapholita</I> species share major sex pheromone components. </LI> <LI> Simultaneous mating disruption (SMD) has been devised using cross-attracting sex pheromone composition. </LI> <LI> SMD application resulted in >90% mating disruption against both species. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Preliminary test for LED wavelength selection for Orius laevigatus (Hemiptera: Anthocoridae) using Y-tube

Young-gyun Park,Min-Jung Kim,Kyusoon Kim,Joon-Ho Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04

Artificial light is frequently used for plant growth and pest attraction traps in greenhouses. In addition, natural enemies may utilize this artificial light for colonization in greenhouses. Orius laevigatus is a biological control agent of whiteflies and thrips. The Y-tube selection test was conducted against O. laevigatus for 11 wavelengths (365, 385, 395, 405, 410-420, 420-430, 440-450, 490-500, 520-530, 590-595 and 620-630 nm) of LED and white light (5000k) for a control . One pipe of the Y-tube was allocated for insect entrance and other two pipes of the Y-tube were installed transparent sticky trap along with white LED and test wavelength, respectively. At least, three replications were conducted for each wavelength and 40 to 60 individuals of O. laevigatus were used for each replication. Attraction rate of 365 to 405 nm wavelength was above 50 % and highest at 385 nm (83.7 %). Attraction rate of 490 to 630 nm was below 20 % and lowest at 620-630 nm (1.4 %). The results indicate that O. laevigatus attracted most to 385 nm wavelength and this light may be useful for using O. laevigatus in green houses. Further research is needed using selected LED wavelength.

Functional response of Amblyseius eharai (Amitai et Swirski) (Acari: Phytoseiidae) to larval Tetranychus urticae (Koch) (Acari: Tetranychidae)

Young-gyun Park,Jaeseong Im,Kyusoon Kim,Joon-Ho Lee 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10

Amblyseius eharai is a native predatory mite in Korea and a candidate of biological control agent to control spidermites. To evaluate the predation ability of A. eharai, its functional response was tested at 10, 30, 50, 70 and 130 larvaeof Tetranychus urticae. A. eharai showed the Type 2 functional response. The attack rate of female and male A. eharaiwas 0.109 and 0.019, respectively. The handling time of female and male was 0.164 h and 0.234 h, respectively. Theattack rate was significantly different between male and females at 95% confidence interval. However, handling time wasnot statistically different. In comparison with Neoseiulus californicus, attack rate and handling time of A. eharai werebetter than N. californicus. These result should be helpful for evaluation of A. eharai for a biological agent against T.urticae.

Patterning of Flexible Transparent Thin‐Film Transistors with Solution‐Processed ZnO Using the Binary Solvent Mixture

Kim, Kyongjun,Park, Siyun,Seon, Jong‐,Baek,Lim, Keon‐,Hee,Char, Kookheon,Shin, Kyusoon,Kim, Youn Sang WILEY‐VCH Verlag 2011 Advanced Functional Materials Vol.21 No.18

<P><B>Abstract</B></P><P>Flexible transparent thin‐film transistors (TTFTs) have emerged as next‐generation transistors because of their applicability in transparent electronic devices. In particular, the major driving force behind solution‐processed zinc oxide film research is its prospective use in printing for electronics. Since the patterning that prevents current leakage and crosstalk noise is essential to fabricate TTFTs, the need for sophisticated patterning methods is critical. In patterning solution‐processed ZnO thin films, several points require careful consideration. In general, as these thin films have a porous structure, conventional patterning based on photolithography causes loss of film performance. In addition, as controlling the drying process is very subtle and cumbersome, it is difficult to fabricate ZnO semiconductor films with robust fidelity through selective printing or patterning. Therefore, we have developed a simple selective patterning method using a substrate pre‐patterned through bond breakage of poly(methyl methacrylate) (PMMA), as well as a new developing method using a toluene–methanol mixture as a binary solvent mixture.</P>

Proton-Conducting Zirconium Pyrophosphate/Poly(2,5-benzimidazole) Composite Membranes Prepared by a PPA Direct Casting Method

Kim, Tae-Ho,Lim, Tae-Wook,Park, Yong-Su,Shin, Kyusoon,Lee, Jong-Chan Wiley - VCH Verlag GmbH & Co. KGaA 2007 Macromolecular Chemistry and Physics Vol.208 No.21

<P>Zirconium pyrophosphate (ZPP)/poly(2,5-benzimidazole) composites were prepared by polymerization of 3,4-diaminobenzoic acid with zirconium hydrogen phosphate in polyphosphoric acid. The composite membranes for polymer electrolyte membranes were prepared by casting the polymerization solutions directly onto stainless steel plates. Membranes doped in 60 wt.-% phosphoric acid solution had high proton conductivity values of more than 0.12 S · cm<SUP>−1</SUP> (at 180 °C and 1% RH). Physical properties of the doped membranes, including the mechanical strength and dimensional stability, improved as ZPP content in the composites increased to 10–20 wt.-%.</P><P> <img src='wiley_img/10221352-2007-208-21-MACP200700261-gra001.gif' alt='wiley_img/10221352-2007-208-21-MACP200700261-gra001'> </P>

배추좀나방에 대한 프루텔고치벌과 미생물농약의 통합생물방제

김규순,김현,박영욱,김길하,김용균,Kim, Kyusoon,Kim, Hyun,Park, Young-Uk,Kim, Gil-Hah,Kim, Yonggyun 한국응용곤충학회 2013 한국응용곤충학회지 Vol.52 No.1

국내 배추좀나방(Plutella xylostella) 집단은 피레스로이드 농약에 대해서 저항성을 보이며, 이는 이 살충제의 작용점인 소듐이온채널 유전자의 돌연변이에 기인된다. 더욱이 배추좀나방은 대부분 상용화된 살충제에 대해서 저항성을 발달시킬 수 있다. 본 연구는 배추좀나방을 효과적으로 방제하기 위해 내부기생성 천적인 프루텔고치벌(Cotesia plutellae)과 미생물농약인 Bacillus thuringiensis의 혼합처리 기술을 개발하기 위해 수행되었다. 프루텔고치벌이 감수성과 저항성 배추좀나방에 대한 기생 선호성에 차등이 있는 지 조사하기 위해 다섯 개 서로 다른 집단에 대해서 살충제 감수성과 프루텔고치벌 기생성 차이를 비교하였다. 이들 배추좀나방 집단들은 피레스로이드, 유기인계, 네오니코틴계 및 곤충성장조절제를 포함하는 세 종류의 상용 살충제에 대한 약제 감수성에서 뚜렷한 차이를 보였다. 그러나 이들 집단들은 프루텔고치벌에 의한 기생률에서는 차이를 보이지 않았다. 더욱이 기생된 배추좀나방은 B. thuringiensis에 대해서 감수성이 증가되었다. 프루텔고치벌이 갖는 면역억제인자 가운데 바이러스 유래 ankyrin 유전자(vankyrin)를 비기생된 배추좀나방에 발현시켰다. Vankyrin의 발현은 배추좀나방 3령충의 B. thuringiensis에 대한 감수성을 현격하게 증가시켰다. 즉, 프루텔고치벌에 의해 야기된 면역저하가 B. thuringiensis의 살충력을 증가시켰다. 이러한 결과들은 프루텔고치벌과 미생물농약인 B. thuringiensis의 혼합처리가 살충제 저항성 배추좀나방을 효과적으로 방제할 수 있다고 제시하고 있다. All tested Korean populations of the diamondback moth, Plutella xylostella, are known to be resistant especially against pyrethroid insecticides by mutation in its molecular target, para-sodium channel. Moreover, P. xylostella is able to develop resistance against most commercial insecticides. This study was performed to develop an efficient control technique against P. xylostella by a combined treatment of an endoparasitoid wasp, Cotesia plutellae, and a microbial insecticide, Bacillus thuringiensis. To investigate any parasitism preference of C. plutellae against susceptible and resistant P. xylostella, five different populations of P. xylostella were compared in insecticide susceptibilities and parasitism by C. plutellae. These five P. xylostella populations showed a significant variation against three commercial insecticides including pyrethroid, organophosphate, neonicotinoid, and insect growth regulator. However, there were no significant differences among five P. xylostella populations in their parasitic rates by C. plutellae. Moreover, parasitized larvae of P. xylostella showed significantly higher susceptibility to B. thuringiensis. As an immunosuppressive agent, viral ankyrin genes (vankyrins) encoded in C. plutellae were transiently expressed in nonparasitized larvae. Expression of vankyrins significantly enhanced the efficacy of B. thuringiensis against the third instar larvae of P. xylostella. Thus an immunosuppression induced by C. plutellae enhanced the insecticidal efficacy of B. thuringiensis. These results suggest that a combined treatment of C. plutellae and B. thuringiensis may effectively control the insecticide-resistant populations of P. xylostella.

Synthesis of gallium phosphide quantum dots with high photoluminescence quantum yield and their application as color converters for LEDs

Yonghoon Choi,Changhoon Choi,Joonwon Bae,Jongnam Park,Kyusoon Shin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

Group III–Ⅴ quantum dots (QDs) are preferred over Group Ⅱ–Ⅵmaterials because of their relatively mildtoxicity. In this study, a facile synthetic method to obtain gallium phosphide (GaP) QDs with color conversionperformance is reported. Colloidal GaP QDs were produced via a hot-injection method using anoptimized combination of precursors. The products showed controllable emissions from 400 to 520 nm,depending on the band gap. High photoluminescence (PL) quantum yields of 35–40% with a full width athalf maximum (FWHM) of 75 nm were achieved in the green emission region. In addition, the greenemissionGaP QDs were applied as a color-conversion material for optical devices with UV and blueLED chips. An average color conversion efficiency of 15% was achieved. This study demonstrates the possibilityof using GaP QDs as a competitive color-conversion material.

Phenology model for first instar of Metcalfa pruinosa (Hemiptera: Flatidae)

Min-Jung Kim,Sunghoon Baek,Young-gyun Park,Kyusoon Kim,Joon-Ho Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10

국내에서 다양한 작물에 지속적으로 피해를 주고 있는 미국선녀벌레는 나무 표피에서 알 상태로 월동하고, 부화한 약충은 이동하여 주로 초본 식물을 가해한다. 이번 연구에서는 미국선녀벌레 약충의 부화시기를 예측하기 위해 4지역(서울, 연천, 수원, 예산)에서 월동난이 있는 가지에서 부화하는 약충을 정기적으로 조사하여 부화 모델을 개발하였고, 각 조사 지역에 투명끈끈이트랩을 설치하여 떨어지는 약충의 수를 조사하여 그 경향을 분석하였다. 미국선녀벌레의 월동난 부화 모델은 약충의 부화시기를 잘 설명하였고(r2=0.98), 5월말에서 6월 초에 50%정도의 부화가 완료되는 것으로 확인되었다. 부화한 약충의 지표면으로의 이동은 부화 직후 1령 시기에 가장 활발한 것으로 나타났다. 이번 연구 결과들은 미국선녀벌레의 부화시기와 기주를 찾아 이동하는 시기를 바탕으로 한 방제 전략을 구축하는데 기여할 수 있을 것으로 생각된다.