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Jeong Jun Kim,Gayoung Jeong,Ji Hee Han,Sang Yeob Lee 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
Use of conidia or spores of entomopathogenic fungi are influenced by environmental conditions such as temperature and relative humidity and caused slow and fluctuation of mortality. In addition, although the fungi have the advantage of a restricted host range, this specificity is one of the limiting factors for their use. These factors are preventing wider application and use of these biocontrol agents. To mitigate such problems we selected an Beauveria bassiana Bb08 which kill green peach aphid with its liquid culture filtrate. In this study we conducted bioassay with the fungal culture filtrate and culture fluid to greenhouse pests such as cotton aphid, whitefly and thrips. Culture fluid showed high mortality against green peach aphid, as well as cotton aphid, sweet potato whitefly, and western flower thrips. However, control effect of culture filtrate varied with pests. Culture filtrate showed high mortality to cotton aphid. Mortality of western flower thrips with culture filtrate was slower than culture fluid including spores and sweet potato whitefly was much lower. These results indicated that the culture fluid of Beauveria bassiana Bb08 has potential to simultaneously control various greenhouse pests.
( Jeong Jun Kim ),( Ling Xie ),( Ji Hee Han ),( Sang Yeob Lee ) 한국균학회 2014 Mycobiology Vol.42 No.4
Recently, the Q biotype of tobacco whitefly has been recognized as the most hazardous strain of Bemisia tabaci worldwide, because of its increased resistance to some insecticide groups. As an alternative control agent, we selected an Isaria javanica isolate as a candidate for the development of a mycopesticide against the Q biotype of sweet potato whitefly. To select optimal mass production media for solid-state fermentation, we compared the production yield and virulence of conidia between 2 substrates (barley and brown rice), and we also compared the effects of various additives on conidia production and virulence. Barley was a better substrate for conidia production, producing 3.43 × 1010 conidia/g, compared with 3.05 × 1010 conidia/g for brown rice. The addition of 2% CaCO3 + 2% CaSO4 to barley significantly increased conidia production. Addition of yeast extract, casein, or gluten also improved conidia production on barley. Gluten addition (3% and 1.32%) to brown rice improved conidia production by 14 and 6 times, respectively, relative to brown rice without additives. Conidia cultivated on barley produced a mortality rate of 62% in the sweet potato whitefly after 4-day treatment, compared with 53% for conidia cultivated on brown rice. The amendment of solid substrate cultivation with additives changed the virulence of the conidia produced; the median lethal time (LT50) was shorter for conidia produced on barley and brown rice with added yeast extract (1.32% and 3%, respectively), KNO3 (0.6% and 1%), or gluten (1.32% and 3%) compared with conidia produced on substrates without additives.
Fe3O4/Laser-Induced Graphene as an Adsorbent for Microplastics Emitted from Household Wastewater
Sung-Yeob Jeong,Naohiko Sugita,Bo Sung Shin 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.3
Removal of microplastics (MPs), which pose a severe threat to humanity and ecosystems, is essential. Although extensive efforts have been made to efficiently remove MPs, it still remains a difficult task. We fabricated Fe3O4/laser-induced graphene, by simply irradiating a laser on the surface of a polymer prepared by homogeneously mixing iron oxide, lignin powder, and polydimethylsiloxane, to efficiently remove household-derived MPs. Subsequently, Fe3O4-laser-induced graphene particles (Fe3O4-LIGPs) were prepared through scrapping and heat treatment. The Fe3O4-LIGPs efficiently adsorbed three types of MPs (melamine—particle size: 2 and 10 μm, polystyrene—particle size: 10 μm, polyamide—particle size: 50 μm) within 300 min and could be easily separated from the solution by using magnetic force. The adsorption of the MPs on the Fe3O4-LIGPs followed the pseudo-first and second-order kinetics and the Freundlich isotherm model. The maximum adsorption capacities of the Fe3O4-LIGPs for the different types of MPs were 1400 (polyamide, 50 μm), 1250 (polystyrene, 10 μm), 1050 (melamine—10 μm), and 775 (melamine—2 μm) mg∙g−1. The Fe3O4-LIGPs were reused seven times for each MP, after heat treatment, and their performance was evaluated.
Different Persistence of Isaria javanica Isolate in Potted Greenhouse Soil
Jeong Seon Yu,Jin Ju Yun,Byung Ju Lee,Jeong Hwa Huang,Jeong Jun Kim,Ji Hee Han,Sang Yeob Lee 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Entomopathogenic fungus is a useful control agent to sucking type insect such as whitefly and aphid. The fungi are influenced by some environmental factors such as relative humidity, temperature and UV and cause slow and fluctuation in pest control efficacy. Especially, UV kills conidia or spores of entomopathogenic fungi and a mycopesticide using fungi has short control period in field. UV intensity changes from season to season. Survival rate of entomopathognic fungi treated may differ from seasons and will show different control efficacy. Therefore, we conducted a study to estimate the persistence of an Isaria javanica isolate, which was already reported as sweet potato whitefly control agent, in potted greenhouse soil planted different crops. The number of survival spore decreased gradually and differ from seasons.
Recent Study of Microbial Insecticides for Insect Pest Control
Jeong Jun Kim,Ji Hee Han,Sang Yeob Lee 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Insect pests have been a serious problem over many years and remain a major threat for food production. Although chemical pesticides are major pest control strategies, use of microorganisms such as entomopathogenic bacteria, fungi, viruses and nematodes have continuously increase last few decades to minimize the use of agrichemicals. According to BBC research, the global biocontrol market was about $2.1 billion in 2011, and this is expected to rise $3 ~ 4 billion by 2017. Over 50 entomopathogens are commercially produced and used augmentatively as microbial pesticides. About 175 biopesticide active ingredients and 700 products have been registered worldwide. Bacillus thuringiensis (Bt), Beauveria bassiana, Metarhizium spp., nuclear polyhedrosis virus and Steinernema spp. are the most popular control agents used in plant protection. Among the microbial control agents Bt products have more than 50% of market share. In Korea, only 13 environmentally-friendly crop protectants were registered for insect pest control in 2015. Market share is very low and has grown slowly. We will discuss how we can expand the market with our techniques.