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Case study on the first immigration of fall armyworm,Spodoptera frugiperda invading into China

Journal of Integrative Agriculture 2021年第3期20卷 664-672页

作者： SUN Xiao-xu HU Chao-xing JIA Hui-ru WU Qiu-lin SHEN Xiu-jing ZHAO Sheng-yuan JIANG Yu-ying WU Kong-ming College of Plant Protection Southwest UniversityChongqing 400716P.R.China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region Institute of EntomologyGuizhou UniversityGuiyang 550025P.R.China National Agro-Tech Extension and Service Center Beijing 100125P.R.China

The fall armyworm(FAW),Spodoptera frugiperda is one of the most damaging crop pests,and it has become major threat to the food security of many *** order to monitor possible invasion of this pest into China,a searchlight trap was established in March 2018 in western Yunnan Province,China,where it has served as the"first station"for many pests that have migrated from Myanmar to China.A number of suspected FAW moths were captured and identified by DNA *** results showed that the FAW moth was first captured on December 11 and formed its first immigration peak in mid-December *** detection revealed that the early invading FAW population was the"corn-strain".The field survey indicated that the pest mainly colonized corn in Pu’er,Dehong and Baoshan *** trajectory simulation implied that the moths might have mainly come from the eastern area in the mid-latitude region of Myanmar(20-25°N,94-100°E).This case study confirmed the first immigration of FAW into China,and will be helpful for guiding monitoring and management work to control this pest.

关键词： Spodoptera frugiperda Yunnan Province China invasion accumulated temperature migration trajectory

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migration of invasive Spodoptera frugiperda(Lepidoptera:Noctuidae)across the Bohai Sea in northern China

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Journal of Integrative Agriculture 2021年第3期20卷 685-693页

作者： JIA Hui-ru GUO Jiang-long WU Qiu-lin HU Chao-xing LI Xiao-kang ZHOU Xian-yong WU Kong-ming State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China College of Plant Protection Shenyang Agricultural UniversityShenyang 110866P.R.China Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region Institute of EntomologyGuizhou UniversityGuiyang 550025P.R.China College of Plant Protection Southwest UniversityChongqing 400716P.R.China

The fall armyworm(FAW),Spodoptera frugiperda(***),is an important agricultural pest with a strong migratory *** the species is native to the Americas,it has recently invaded China,ravaging crops in many provinces(autonomous regions,municipalities).Its long-distance migration,which is critical to understand for pest management programs,has been well studied in its native *** other regions however,the moth’s migration patterns have not yet been ***,the migratory behavior of FAW populations in China was studied on an isolated island located in the center of the Bohai Strait from spring to autumn 2019,the year in which FAW first reached this region,by using searchlight trapping,stable carbon isotopes and trajectory *** main results were summarized as follows:(i)The number of FAW moths caught by searchlight trapping provided direct evidence that the species migrated across the Bohai Sea.(ii)Species identification was confirmed by both morphology and molecular methods,and only the"corn-strain"that preferentially infests maize and sorghum was found in the collections.(iii)Stable carbon isotope measurements showed that up to 95.07%of captured moths displayed the C4 isotope signature,thus providing additional evidence that this species is a migrant as there are no major C4 plants at the trapping site.(iv)Backward trajectory analysis indicated that the pest now threatens to expand its range into the agriculturally important region of Northeast China,and thus authorities in this region should be vigilant to the threat posed by this ***,these findings add to our knowledge concerning the occurrence of FAW in northern China,and will help us to develop sustainable and effective monitoring,forecasting,and pest management strategies.

关键词： Spodoptera frugiperda overseas migration searchlight trapping host strains stable carbon isotopes migration trajectory

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Analysis on the migration of first-generation Mythimna separata(Walker) in China in 2013

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Journal of Integrative Agriculture 2018年第7期17卷 1527-1537页

作者： ZHANG Zhi ZHANG Yun-hui WANG Jian LIU Jie TANG Qing-bo LI Xiang-rui CHENG Deng-fa ZHU Xun State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China Beijing Plant Protection Station Beijing 100029P.R.China National Agro-tech Extension and Service Centre Beijing 100025P.R.China College of Plant Protection Henan Agricultural UniversityZhengzhou 450002P.R.China

Mythimna separata（Walker） is an important pest which can cause serious damages to cereal crops. In the past two decades, several heavy outbreaks have taken place in northern China. In order to develop a fine-scale method of forecasting outbreaks, population data were collected in northern China using searchlight traps and ground light traps. A background weather pattern analysis and trajectory analysis were performed via the Weather Research and Forecast（WRF） and FLEXPART models. Our results showed that heavy migration of first-generation M. separata appeared in northern China in 2013. In Yanqing District, Beijing, the cumulative number of captured adults in searchlight traps was around 250000 and the daily maximum for trapped moths was 86000. During the peak period, the majority of M. separata moths arrived after 00：00 every night. The sex ratio（female：male） at each monitoring site was greater than 1 and greatly fluctuated with population dynamics. During the migration peak, prevailing downdraft winds benefited M. separata moths to land passively. trajectory simulation showed that immigrants were from Anhui, Jiangsu and Hubei provinces and most of them could continue to fly into the northeastern regions of China. These results provide technical support for fine-scale forecasting of the outbreak of M. separata at meso-and micro-scale.

关键词： Mythimna separata population dynamics migration trajectory

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Lagrangian-based spatial-temporal topological study on the evolution and migration of coherent structures in wall turbulence

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Acta Mechanica Sinica 2022年第1期38卷 91-99页

作者： Haiping Tian Xingrui Yi Fang Xi Fen Li Nan Jiang National Demonstration Center for Experimental Mechanics Education Taiyuan University of TechnologyTaiyuan 030024China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanics Tianjin UniversityTianjin 300350China

In this work,we study the development,evolution,and migration of turbulent coherent structures in the turbulent boundary layer at Reτ=630 using time-resolved particle image velocimetry(TR-PIV).Multiple techniques,including multi-scale analysis,conditional averaging,cross-correlation,and spatial-temporal topological analysis are applied to extract the evolution principle,migration trajectory,and convection velocity vector of the targeted coherent structures from a Lagrangian *** spanwise vortex structures with larger scale and intensity at a certain wall-normal height y were the main focus of the present *** the statistical sense,spanwise vortex structures move away from the wall with the shape changing from a bulge to an ellipse,and finally to a *** straight lines emerge from the mean transfer trajectory curve of the spanwise vortex,in which the horizontal one is located at the viscous sublayer(y^(+)migration path is fixed at around 12°.The streamwise convection velocity U_(c)of scaled spanwise vortex structures satisfies U_(c)/U_(∞)=0.5-0.6 below y=0.03δ(i.e.,U^(+)_(c)=11-13 undery^(+)=20).In particular,in the region of 50migration trajectory of spanwise vortex structures.

关键词： Coherent structures Convection velocity migration trajectory Development and evolution Spatial-temporal topology

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