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You-Kyoung Lee,Sang-hyeok Im,Nak-Jung Choi,Bo Yoon Seo 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
Because Scotinophara lurida has the habit of living under the rice plant, an introduction of a method for efficient control when spraying eco-friendly organic materials is needed. In this study, we investigated the density of S. lurida in drained- and irrigated-paddy field after spraying an organic material containing garlic bulb extracts, which has high insecticidal activity in S. lurida in direct spraying test in glass tube. As a result, an irrigated rice paddy showed a control effect of 66.4% after 3 days of spraying and 86.2% after 7 days, while a drained rice paddy showed a control effect of 33.9% after spraying and 61.9% after 7 days. These results suggest that effective control can be achieved in irrigated rice fields if organic farming materials are evenly sprayed and reach to the body of S. lurida. It is remained to study how irrigated water do contribute to increase the insecticidal effect in the future.
You-Kyoung Lee,Sang-hyeok Im,Nak-Jung Choi,Bo Yoon Seo 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
Scotinophara lurida is one of major sap-sucking pests in an organic rice farming paddy fields in Korea. Several Poaceae grasses (e.g, rice, barley etc) have been known as a host plant. To find out a true host plant of S. lurida, the developmental characteristics such as weight gain and developmental duration were checked on total eight grasses species including rice and corn. In the results, weight of the fifth nymphal stage was the highest value in the barnyard millet and rice plant. In addition, nymphal duration was the shortest value in the barnyard millet and rice plant. But, in corn and common millet plant, S. lurida nymphs could not complete the development to the adult stage. These results suggest that six Poaceae grasses including rice and barnyard millet out of eight test grasses are close related to true host plants of S. lurida.
Nak Jung Choi,You-Kyoung Lee,Bo Yoon Seo,Thai Thanh Tuan 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
Insects, including aphids, caterpillars, and beetles, have a significant impact on biodiversity, ecology, and the economy by consuming various plant tissues like leaves, stems, and fruits, leading to issues such as holes, defoliation, and impaired growth. Consequently, our study's primary goal was to establish a model system capable of identifying and tracking insects, covering aspects like their behaviors, movements, sizes, and patterns. Our research has successfully produced a 3D monitoring system specifically designed for continuous insect tracking by applying it to brown planthopper. This technology allows for in-depth exploration of insect behaviors and their interactions with plants and crops. The potential applications of this technique are highly promising, offering valuable assistance to researchers in unraveling insect behavior and ecological dynamics and driving further advancements in these crucial research areas.
ON MATHEMATICAL TO NONLINEAR(曲線) KINETICS WITH INTRAMASS DIFFUSION UNIMOLECULAR REACTION
Won, You-Sung,Yoon, Ryong-Soo,Jeong, Il-Hyun,Kang, Shin-Choon,Ham, Young-Min,Kang, Doo-Whan,Lee, Chul-Tae,Ma, Young-Dai,Choi, Nak-Mann,Moon, Sei-Ki,Kim, Hyung-Jin,Park, Kyung-Ai,Lee, Chang-Ou,Chun, Bu 단국대학교 대학원 1989 學術論叢 Vol.13 No.-
Equations to mass transfer with nonlinear kinetics from Langmuir-Hinshelwood model or so were thought in this article. We used the perturbation method with simplified Taylor expansion method to attain the solution semianalytically. We even carried out the comparison in effectiveness factor by both. For numerical solution, we introduced Gauss-Siedel method, for the method had been rarely used. Unimolecular recation having Langmuir-Hinshelwood model wass a sample. We perceived the perturbation method to be useful for the q<10 or q>5 in the mode d^2Θ/dN^2 = Ø^2Θ/1+qΘ We, on the other hand, attained the solution without difficulty from the simplified method.