단감 탄저병 방제법 개선을 위한 살균제 선발 및 효과

전창욱(Chang Wook Jeon),권영호(Youngho Kwon),이정한(Jung Han Lee),곽연식(Youn-Sig Kwak) 한국농약과학회 2015 농약과학회지 Vol.19 No.3

Anthracnose, caused by Colletotrichum spp. is the most important and devastating disease in sweet persimmon production in worldwide. There is no alternative control method or resistant cultivar is available. Therefore, chemical controls are widely accepted to control the disease. Three fungicides among 16 fungicides have been selected to apply in field condition. The selected three fungicides (metconazole, dithianon and propineb) showed lower EC50 and reliable control effect in both in vitro and in vivo. According to general guide line of anthracnose disease control method recommended 8 times spay of the fungicide. In this study, we performed 8, 4, and 2 times spay of the fungicides. For 8 times application, practice spray machine has been used and for 4 and 2 time application, a recently invented spray machine was input. The fungicides have been treated from middle of June to end of August in 2014 year. Control effect of among the selected fungicides showed similar result regardless of sort of the fungicide. However, frequency of spray result showed significantly different results, 8 and 4 times fungicide application showed low and similar disease occurrence, but 2 times application showed intermediated disease occurrence between 4 times treatment and untreated control. Taken together, result showed that 4 times application with effective fungicide, mechanically advanced tool can reduced the anthracnose disease damage in sweet persimmon production.

Sclerotium rolfsii에 의한 비름 흰비단병 최초 보고 및 방제 약제 선발

전창욱(Chang-Wook Jeon),김다란(Da-Ran Kim),곽연식(Youn-Sig Kwak) 한국농약과학회 2020 농약과학회지 Vol.24 No.1

Symptoms of disease related to southern blight have been observed in a greenhouses located in Goseong-gun Gyeongnamon plant species Amaranthus mangostanus common name: Amartanth). This research was aimed at reporting on A. mangostanus the first case of southern blight disease and also to screen effective fungicides against the causal pathogen. The pathogen was described using morphological and molecular characteristics as Sclerotium rolfsii. Among the fungicides studied, to compare untreated control, flutolanil EC and fluxapyroxad SC contributed to disease prevention by more than 80%. The findings are expected to serve as fundamental data for the development of potential fungicides to register Southern blight disease on A. mangostanus.

갯기름나물 시들음병 보고 및 방제약제 선발

권슬기(Seul Ki Kwon),전창욱(Chang-Wook Jeon),곽연식(Youn-Sig Kwak) 한국농약과학회 2020 농약과학회지 Vol.24 No.1

Peucedanum japonicum is a subtropical annual plant belonging to the family Apiaceae. P. japonicum leaves and roots were used as home remedies, such as cough and neuralgia. Fusarium solani in P. japonicum has been described as a causal pathogen for the wilt disease. In Korea the pathogen has not yet been identified. Of the five selected fungicides, the control value of propaocarb hydrochloride and hymexazol exceeded 80%. The results suggest that these fungicides are appropriate for controlling Fusarium wilt in P. japonicum as chemical control agents.

국제특허분류(IPC) 코드 기반 특허네트워크 비교분석에 관한 연구

이대용(Dae-Yong Lee),전창욱(Chang-Wook Jeon),김선근(Sun-Geun Kim) 인문사회과학기술융합학회 2018 예술인문사회융합멀티미디어논문지 Vol.8 No.10

본 연구는 국제특허분류(IPC)코드 기반의 특허 네트워크 비교 분석에 관한 연구로 식물공장(Smart farm) 관련 기술의 국제적인 추세 및 특성을 파악하기 위해 미국, 일본, 한국 특허출원을 비교대상으로 하였다. IPC 코드의 그룹 및 클래스수준 별 출원을 조사하여 핵심 기술 분야와 특허 기술변화를 분석하였고 Markov Chain Monte Carlo 네트워크 유의성 검정을 통하여 정책적 시사점을 도출하였다. 식물공장에 있어 미국 특허출원의 경우는 시스템제어 및 시설기술이, 일본 특허출원의 경우 양액과 컨베이어 등 재배기술이, 한국의 경우 조명과 Smart System 등 IoT 응용기술 중심의 연결관계 특성이 파악되었다. 본 연구에서 제시한 IPC코드 기반 특허 네트워크 비교분석을 통해 기술의 트렌드를 보다 심층적으로 예측할 수 있다. 이러한 분석결과를 기반으로 국내 기업들은 향후 각 분야별 기술로드맵에 따라 세계 주요국의 출원에서 중점적으로 진행되고 있는 분야에 관한 지식을 검토하여 지속적으로 관련기술을 연구개발 하여야 함을 제시하였다. This study is about the Patent Network Comparitive analysis of relevant countries and technologies based on International Patent Classification (IPC) code. Totally 836 patent applications in the field of Smart farm are the subjects of this study. First, we investigated the number of applications and registrations per IPC code so that we could analyze the core technology areas and the status of patent application. In addition, we examined the convergence of technologies by investigating Patent Network from interconnections between main and subcategories of IPC codes. Lastly, we looked into the changes in patent technologies by investigating the status of application per IPC code in accordance with year. By analyzing the IPC code based patent information used in this study, we could further expect the trends of technologies.

여름잎마름병(Summer patch) 병원균에 대한 살균제의 억제효과 조사

이정한,심규열,김정호,전창욱,곽연식,Lee, Jung Han,Shim, Gyu Yul,Kim, Jeong Ho,Jeon, Chang Wook,Kwak, Youn-Sig 한국잡초학회 한국잔디학회 2017 Weed & Turfgrass Science Vol.6 No.2

국내 Kentucky bluegrass로 조성된 골프장이나 잔디 재배지에서 여름철에 여름잎마름병 발생으로 인한 피해가 심각한 상황이다. 그럼에도 불구하고 여름잎마름병방제약제가 아직까지 등록되어있지 않아 병원균에 효과적인 약제를 선발하기 위하여 본 연구를 수행하였다. 전형적인 여름잎마름병 병징에서 병원균을 분리하였고 ITS1과 ITS4 염기서열 분석으로 Magnaporthiopsis poae로 동정되었다. 잔디용으로 사용되는 10개의 약제를 대상으로 병원균 반응을 조사한 결과, 약제의 농도가 높아질수록 병원균 생장을 억제하였고 시간이 경과할수록 병원균 억제효과가 떨어지는 것이 관찰되었다. triazole계 약제 4종(metconazole, myclobutanil, propiconazole과 tebuconazole)의 병원균 억제효과는 100%로 나타났다. 다음으로 thiophanate-methyl의 억제효과가 높았으며 strobilurin계의 약제인 azoxystrobin, pyraclostrobin과 trifloxystrobin 약제를 비교하였을 때는 pyraclostrobin 약제가 가장 높게 나타났으며 다음으로 azoxystrobin과 trifloxystrobin 순으로 나타났다. Fludioxonil과 fluxapyroxad의 병원균 억제효과는 trifloxystrobin과 유사하게 나타났다. Summer patch is the most serious disease at turfgrass field or golf course established with Kentucky bluegrass during high temperature season in Korea. Nevertheless, chemicals for the summer patch control are not yet registered in Korea. We isolated the pathogens from the turfgrass showing typical summer patch symptoms and identified as Magnaporthiopsis poae by using the internal transcribed spacer ITS1 and ITS4 sequences of rDNA. The inhibition rates of the pathogen were investigated for 10 fungicides. As results, the pathogen growth was suppressed when chemicals concentration increased and negatively correlated with incubation period with the chemicals. In triazole group, all chemicals (metconazole, myclobutanil, propiconazole and tebuconazole) treated showed the inhibition rates by 100%. Thiophanate-methyl showed the next highest inhibition effect against a summer patch pathogen. In strobilurin group, pyraclostrobin was the highest suppression effect compared with azoxystrobin and trifloxystrobin. Inhibition effect of fludioxonil and fluxapyroxad on pathogen was similar to the trifloxystrobin. Based on the results, triazole and carboxamide groups are strongly recommended due to the highest inhibition effect on the summer patch pathogen, Magnaporthiopsis poae.

수출딸기 선별장에서 잿빛곰팡이병원균 밀도조사와 저장온도에 따른 잿빛곰팡이병 발생 연구

김다란(Da-Ran Kim),전창욱(Chang Wook Jeon),곽연식(Youn-Sig kwak) 한국농약과학회 2015 농약과학회지 Vol.19 No.3

Currently, amount of export strawberry has been continuously increased to ship many south Asia countries, including Hong Kong and Singapore. In the distribution process, significant damage to the quality has been caused depending on the environmental conditions. Gray mold disease caused by Botrytis cinerea has been known as major damage to the export strawberry, and the disease was caused during shipping and distribution to the final consumers. This study was performed to assess the relationship between pathogen density in packing shed and disease incidence of gray mold during storage period. Maximum gray mold disease incidence in storage period was up to 16% with low temperature condition (4℃). At room temperature condition, the disease incidence reached up to 100% even densities of the pathogen spore were recorded relatively low in the packing shed. As results of the study, the correlation between pathogen density in the air and disease occurrence clearly clarified.

딸기 위황병원균 Fusarium oxysporum f sp. fragariae의 살균제 감수성 평가

권슬기(Seul Ki Kwon),전창욱(Chang-Wook Jeon),남명현(Myeong Hyeon Nam),곽연식(Youn-Sig Kwak) 한국농약과학회 2020 농약과학회지 Vol.24 No.1

Strawberry is an important cash crop worldwide and mainly produced in China, the United States, Mexico, Egypt, Turkey, and Spain. In Korea, it is also an economically valuable agriculture product of about $ 667 million annually. Fusarium wilt (Fusiarum oxysporum), anthracnose (Colletotrichum spp.) and gray mold (Botrytis cinerea) disease have been known as major biological problems in strawberry production. Fusarium wilt management depended on the disease-free plant and soil fumigants, but no appropriate fungicides have been selected. In this study, EC<SUB>50</SUB> values of three fungicides were evaluated for 93 Fusarium oxysporum f sp. fragariae strains isolated from five regions nationwide. ANOVA analyses and Duncan’s test to investigate the relationship between EC<SUB>50</SUB> values and biological factors were studied. The most important finding in this study was that EC<SUB>50</SUB> of Tebuconazole was significantly different by location and EC<SUB>50</SUB> of Prochloraz Mn showed segregation based on the strawberry variety. Copper hydroxide showed no correlation with environmental parameters. The results will provide a piece of fundamental knowledge for preserving the strawberry Fusarium wilt disease.

한국 잔디 근권에서 분리된 Streptomyces spp.의 살균제에 대한 반응조사

이정한(Jung Han Lee),민규영(Gyu Young Min),전창욱(Chang Wook Jeon),최수민(Su Min Choi),심규열(Gyu Yul Shim),곽연식(Youn-Sig Kwak) 한국농약과학회 2015 농약과학회지 Vol.19 No.1

Streptomyces spp. isolated from turfgrass rhizosphere and tested for their response to large-patch control fungicides. The tested fungicides were actually used in golf course or turfgrass cultivation to prevent large-patch disease. Tolerance to 3 triazole group of the strains was the highest to the PR fungicide, and following the SR fungicide, whereas the isolated strains were no tolerance to HR fungicide. Tolerances to three kind of Strobilurin group were similar for the all of the tested Streptomyces spp.. Growth and sporulation of the all strain was normal in CB and AP fungicide treatments. However no spore formulated in double concentration. Strains, tolerance to acetanilide fungicides, appeared that KT fungicide tolerance was higher than MK fungicide. The selected strains showed strong tolerance against AT fungicide but have no tolerance to ATR fungicides. In conclusion, the bacterial strains showed tolerance against 1 carbamate, 1 organophosphate and 1 cyanopyrrole group, while have no tolerance against two mixture formulations (1 Quinone + Strobilurin and 1 Imidazole + Triazole).

토마토 꽃과 수정용 벌집으로부터 잿빛곰팡이병 방제 길항균주 선발

김다란(Da-Ran Kim),이준택(Jun-Taek Lee),김혜선(Hye sun Kim),전창욱(Chang Wook Jeon),곽연식(Youn-Sig Kwak) 한국농약과학회 2017 농약과학회지 Vol.21 No.1

Gray mold disease, cause by Botrytis cinerea, occurs severe damage on varieties of fruit and vegetable production, and have no a critical control method. In case of chemicals control, it is a trigger emergence of drug resistance strains due to using them continuously. In addition, the pathogen is difficult to control naturally because it is possible to survive regardless of host status. In this study, microorganisms were isolated from tomato flower and hive samples and in order to select suitable microbial control agents for tomato gray mold disease. During six-months study, we isolated 1,004 isolates from flower and 925 isolates from pollinator hive samples. Among them, 6 strains were selected based on result of antifungal activity test. The selected strains showed not only strong antifungal activity against gray mold pathogen, but also cellulase and protease enzyme activities. The selected strains were identified as Paenibacillus polymyxa. In plant assay, P. polymyxa prevented the gray mold disease occurrence near 75%.

[논문]플라이 애쉬가 혼합된 해성점토의 지반공학적 특성

전창욱,권정근,임종철 釜山大學校生産技術硏究所 2007 生産技術硏究所論文集 Vol.66 No.-

연약지반의 해성 점토로 매립된 준설토지반의 지반개량에는 일반적으로 GCP(Gravel Compaction Pile) , SCP(Sand Compaction Pile) , CDM(Cement Deep Mixing)과 같은 부분치 환공법 과 Lime (Broms et al., 1997) 이나 플라이 애쉬,시멘트 등을 혼합한 전체치환공법 등이 이용되고 있다. 그 중 플라이 애쉬는 화력발전 후 발생하는 2차 부산물로 자원의 재활용 측면에서 친환경적이며,지속적인 공급과 저렴한 가격으로 인하여 다양한 활용방안이 연구되고 있다. 이에 본 연구에서는 완도 해성 점토에 플라이 애쉬를 혼합하여 흔합함유량에 따른 다짐특성,합축지수,압멸계수 투수계수 시간에 따른 크리프 특성,비배수 전단강도 등의 지반공학적 특성을 분석하여 효율적인플라이 애쉬 함유량을 산정하였다.