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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%.
접종방법에 따른 딸기모무늬병원균의 발병도 검증 및 친환경 방제 효과
김다란(Da-Ran Kim),강근혜(Gun-hye Gang),조현지(Hyun-ji Cho),윤혜숙(Hae-Suk Yoon),명인식(In Sik Myoung),곽연식(Youn-Sig kwak) 한국농약과학회 2016 농약과학회지 Vol.20 No.1
Recently, bacterial angular leaf spot disease, caused by Xanthomonas fragariae, causes severe damage in strawberry production and its’ export to other countries, since the pathogen has been classified as an A2 quarantine pathogen. Typical the Angular Leaf Spot (ALS) disease represent that water-soaked angular spots symptoms, bacteria ooze exudate under relatively high humidity condition and later the spot become reddish brown on the leaf surface. The pathogen disseminated by irrigation water, infected mother plant and farmer’s hand. In this study, we reported that rubbing inoculation method showed more effective in the pathogen dissemination than infiltration with needles, regardless the strawberry cultivars. Additionally, Dichloroisocyanurate (NaDCC) treatment in commercial strawberry fields provided reliable efficiency to reduce the bacterial angular leaf spot disease incidency and severity.
도라지와 더덕 뿌리썩음병의 방제 효과에 미치는 재배환경의 영향
김다란(Da-Ran Kim),강근혜(Geun-Hye Gang),정희준(Hee Jun Jung),홍성원(Sung Won Hong),곽연식(Youn-Sig Kwak) 한국농약과학회 2016 농약과학회지 Vol.20 No.2
Platycodon grandiflorum and Codonopsis lanceolata have been considered as cash vegetables and alternative medicine plants in Korea. In a previous survey from 1998 to 2010, repeated cultivation of the plant increased root rot disease incidence and severity. The disease has been recognized as critically limiting factor for crop production. However, control method has not been established for the disease of P. grandiflorum and C. lanceolata. In this study, control efficacy of Tebuconazole EC, Trifloxystroim SC and grapefriut extract was evaluated on the root rot disease of these plants in two different field conditions. Three of different fungicide were non critical effect to the disease severity and the control value, but grapefriut seed extract (GSE) was more ability to control the disease in C. lanceolata. In most things, soil drainage was the most important to decrease the disease severity and to improve the control value.
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 세균모무늬병(Xanthomonas fragariae)의 방제를 위한 약제 선발
김다란(Da-Ran Kim),강근혜(Geun-Hye Gang),조현지(Hyun ji Cho),명인식(Inn-Shik Myung),윤혜숙(Hae-Suk Yoon),곽연식(Youn-Sig Kwak) 한국농약과학회 2015 농약과학회지 Vol.19 No.3
In Korea, Strawberry bacterial angular leaf spot disease was first reported in 2010. The disease of strawberry caused serious problem for strawberry producers and export. To field test, we applied the bactericides in June and October as nursery stage and cultivation stage, respectively. In nursery stage with high temperature condition, Oxolinic acid (97.2%) showed significant control effect. In cultivation stage with low temperature condition is soil sterilization and soil non- sterilization the control effect. In cultivation stage in soil sterilization stage Validamycin (93.3%) showed reliable control effect against the disease. Also, soil non-sterilization stage with low control effect of Validamycin (80%) showed control effect the lower than a soil sterilization stage.
딸기 주요 병원균에 대한 친환경제제 NaDCC의 항균활성 및 병 방제효과 평가
김다란(Da-Ran Kim),강근혜(Gun-hye Gang),조현지(Hyun-ji Cho),윤혜숙(Hae-Suk Yoon),곽연식(Youn-Sig kwak) 한국농약과학회 2015 농약과학회지 Vol.19 No.1
Various diseases occur in fruits, leave and roots during strawberry cultivation and cause severe economical damage and huge amount of chemical fungicide use. Recently, as consumers’ interest in safety of foods and organic agriculture produces have increased, control measures using alternatives for chemical fungicides have been newly developed in various ways. This study was conducted to test antifungal activity and control effect of sodium dichloroisocyanurate (NaDCC), using as disinfectants, against major disease pathogens of strawberry, Fusarium oxysporum (Fusarium wilt), Colletotrichum gloeosporioides (Anthracnose) and Phytophthora sp. (Phytophthora blight), and Xanthomonas fragariae (bacterial angular leaf spot) and evaluate availability as environment-friendly materials. When NaDCC was treated at the concentration range of 150 to 300 ppm, it suppressed significantly hyphal growth and reduced spore germination by more than 28%. In field condition, NaDCC showed excellent control effect (control value: 50%) against the bacterial angular leaf spot disease. Based on above-described results, we suggested that NaDCC can be used as alternative candidates to chemical pesticide alternatives of for controlling strawberry diseases.
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.
김수현(Su-Hyeon Kim),김다란(Da-Ran Kim),곽연식(Youn-Sig Kwak) 한국농약과학회 2020 농약과학회지 Vol.24 No.3
Ginseng (Panax ginseng C. A. Meyer) are cultivated in Korea, Japan, and China as major production countries. The ginseng contains anti-aging substances, it is pretended a very important medicinal plant. While ginseng grown for 4 – 6 years in soil and may be diseased by a variety of soil-borne pathogens. Biological control approach has potential to suppress ginseng root rot disease. In this study, we investigated the biocontrol agents against ginseng root rot disease, which usually occurs during high temperature and humid periods. Fusarium sp. was isolated and characterized from more than 50% of the root rot diseased plant. In addition, antifungal activity was verified by separating the ginseng rhizosphere microorganisms, and 8 strains of Bacillus species and one strain of Ensifer adhaerens presented reliable antifungal activity against the root rot pathogen. In this study, we presented that Fusarium sp. is the major ginseng root rot pathogen during summer season and selected microbes may consider as a sources of biological control agent for the root rot disease.
참다래 궤양병원균 Pseudomonas syringae pv. actinidiae에 대한 항세균 지의류 추출물 및 방선균 선발
이수인(Su In Lee),김다란(Da-Ran Kim),곽연식(Youn-Sig Kwak) 한국농약과학회 2021 농약과학회지 Vol.25 No.3
Kiwifruit bacterial canker disease, caused by Pseudomonas syringae pv. actinidiae (Psa), is the most destructive disease in kiwifruit production. Management of Psa is a critical issue in kiwifruit industry worldwide. Emerging resistance strains of Psa against antibacterial agents such as streptomycin makes it difficult to control the cankers disease. Currently effective treatments for Psa infection are scarce, and copper contained agrochemicals are often sprayed in kiwifruit orchards. Therefore, control of the pathogen with new antibacterial compounds and bio-compounds that required to replace the agrochemicals. This study has focused to investigate potential resources as new anti-Psa agent in lichen extracts and Streptomyces spp. libraries. Among 622 lichen extracts, 7 lichen extracts were selected as anti-Psa resources through screening for strength inhibition the Psa pathogen growth. From 1,006 Streptomyces spp., 4 strains effectively inhibited the Psa. The finding suggests that the 7 lichen extractions and 4 Streptomyces spp. could be useful to control the kiwifruit bacterial canker disease.