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Distribution and flavivirus detection of mosquitoes by collecting trap in Gyeongbuk province in 2017
Myeonghwan Kim,Eunyoung Choi,Jongbong Choi,Hyunji Lee,Sungho Lee,Wook-Gyo Lee,Young Ho Kim,Jongkyun Park 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
We investigated population densities of mosquitoes in Gyeongbuk region from March to November, 2017 and pathogens were detected from the mosquitoes. Mosquito populations were investigated at 3 sites in downtown and 1 site in cowshed in Andong, 3 sites in Yeongdeok downtown and 3 sites near migratory birds habitat in Sangju by collecting trap. Total collected female mosquitoes were 7 genus, 13 species, 9,892 individuals and relatively dominant ratios are Aedes vexans (40%), Ae. albopictus (20%), Culex pipiens (16%). Flavivirus were monitored in 9,125 collected mosquitoes by real-time PCR and no target flavivirus causing infectious diseases were detected in Gyeongbuk area in 2017.
Myeonghwan Kim,Eun Young Choi,Jong Bong Choi,,Taeyeong Kwon,Hee Soo Lee,Seungmin Shin,Gnim Sodavy,Jong Kyun Park 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
The rate of resistant pest emergence has accelerated due to the continuous use of pesticides. Therefore, it is important to formulate insecticide resistance management measures and effective control methods for pest. Bemisia tabaci, a greenhouse pest, causes direct damage to crops such as growth inhibition and leaf discoloration at all developmental stages except for eggs. It also indirectly damages plants by secreting honeydew, which covers surrounding leaves and fruits, leading to sooty mold development. In this study, eight insecticides with high usage rates, categorized by their mode of action, were selected. Samples of Bemisia tabaci were collected from six regions, and resistance analysis were conducted. The results showed that Flonicamid exhibited a resistance ratio of 8.91 in Sejong, while Pyriproxyfen showed a high resistance ratio of 63.56 in Gunwi. Fluxametamide, Spinetoram, Cyantraniliprole, Dinotefuran, Pyridaben, and Milbemectin displayed resistance ratio ranging from 0.02 to 1.14 in most regions, except for Flonicamid and Pyriproxyfen.
Comparison of Male Genitalia of the Coptolabrus smaragdinus (Coleoptera: Carabidae) from South Korea
Myeonghwan Kim,Eun Young Choi,Jong Bong Choi,Taeyeong Kwon,Seungmin Shin,Gnim Sodavy,Jong Kyun Park 한국응용곤충학회 2024 한국응용곤충학회 학술대회논문집 Vol.2024 No.04
Currently, 12 subspecies of Coptolabrus smaragdinus have been recorded in Korea, of which 7 subspecies are listed in South Korea. C. smaragdinus has limited movement due to degenerated hindwings, resulting in high intraspecific diversity due to geographic isolation. Previous studies have been mainly classified based on external characters or genitalia structure, but the differences between subspecies are very ambiguous. In this study, we aimed to more clearly distinguish at the subspecific classification level, by examining the male aedeagal and inflated endophallus. Additionally, we provide photos of adult, endophallus and the process of endophallus inflation.
Tensile and Microstructural Characteristics of Fe-24Mn Steel Welds for Cryogenic Applications
Myeonghwan Choi,Junghoon Lee,Hyunbin Nam,강남현,김명현,Daewon Cho 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.2
Herein, we investigated the weldability and relationship between microstructure and tensile properties in 24 wt% Mn steelwelds and, specifcally, submerged arc welds (SAWs) were produced using these welds for cryogenic applications. The basemetal (BM) and weld metal (WM) exhibited a stacking fault energy (SFE) that maintained a stable austenite phase for 27.1and 17.0 mJ/m2, respectively. Deformation twins were observed after tensile testing of the BM and WM at 298 K. Weld metals using undermatched fllers showed a lower SFE and coarser grain size (~ 86 μm) compared to that of the BM (~ 12 μm). Therefore, the tensile testing at 110 K produced deformation twins and ε-martensite. The formation of ε-martensite withdeformation twins antedated necking during tensile testing and elongation decreased at 110 K. However, the SAWs of highMn steels maintained excellent low-temperature mechanical properties such as elongation, tensile strength, and yield strengthwith values of 20%, 1150 MPa, and 617 MPa, respectively.
Myeonghwan Kim,Eun Young Choi,Jong Bong Choi,Taeyeong Kwon,Hee Soo Lee,Seungmin Shin,Gnim Sodavy,Jong Kyun Park 한국응용곤충학회 2024 한국응용곤충학회 학술대회논문집 Vol.2024 No.04
The continuous use of pesticides with the same mode of action has lead to the development of insecticide resistance in the target pests. Establishing pesticide resistance management methods and effective control strategies for these pests has become an important target. Bemisia tabaci, a representative pest of greenhouse, directly affects the growth of crops at all stages of its development except eggs. It also causes indirect damage by secreting honeydew that eventually promotes sooty mold in leaves and fruits. In this study, eight insecticides with different mechanisms of action (Flonicamid, Fluxametamide, Spinetoram, Cyantraniliprole, Dinotefuran, Pyridaben, Milbemectin and Pyriproxyfen), and registered for use against cucumber B. tabaci were selected and tested for insecticide resistance. The tested populations of B. tabaci were collected from greenhouse cucumber cultivations in 12 domestic regions. The results were presented as RR (Resistance ratios), and CEI (Control efficacy index) values.