The fall armyworm(FAW),Spodoptera frugiperda,is a migratory noctuid pest that has recently invaded eastern Asia.From 2017 up till 2020,searchlight trapping was used to assess the extent of FAW migration across the Sou...The fall armyworm(FAW),Spodoptera frugiperda,is a migratory noctuid pest that has recently invaded eastern Asia.From 2017 up till 2020,searchlight trapping was used to assess the extent of FAW migration across the South China Sea.Molecular and morphology-based identification confirmed that FAW made its first appearance on Yongxing Island on 11 April 2019,with most trapped individuals belonging to the S.frugiperda"corn-strain".Carbon isotope analysis further showed that FAW moths originated from C4 host plants,while trajectory analyses revealed that migratory S.frugiperda adults are able to cross the South China Sea and enter China's Mainland.This long-distance migration process plausibly results in frequent genetic mixing between domestic FAW populations and those of neighboring Southeast Asian countries.Overall,this work provides unique insights into FAW migration across eastern Asia and ultimately can help advance pest forecasting,risk assessment and area-wide pest management.展开更多
The fall armyworm(FAW),Spodoptera frugiperda(J.E.Smith),is an important agricultural pest with a strong migratory ability.While the species is native to the Americas,it has recently invaded China,ravaging crops in man...The fall armyworm(FAW),Spodoptera frugiperda(J.E.Smith),is an important agricultural pest with a strong migratory ability.While 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 region.In other regions however,the moth’s migration patterns have not yet been characterized.Here,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 simulation.The 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 species.Together,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.展开更多
基金supported by the National Natural Science Foundation of China(31727901 and 31901873)the Key R&D Projects of Hainan Province,China(ZDYF2018040)+1 种基金the Central Public-Interest Scientific Institution Basal Research Fund,China(CAAS-ZDRW202007)the China Postdoctoral Science Foundation(2019M660896)。
文摘The fall armyworm(FAW),Spodoptera frugiperda,is a migratory noctuid pest that has recently invaded eastern Asia.From 2017 up till 2020,searchlight trapping was used to assess the extent of FAW migration across the South China Sea.Molecular and morphology-based identification confirmed that FAW made its first appearance on Yongxing Island on 11 April 2019,with most trapped individuals belonging to the S.frugiperda"corn-strain".Carbon isotope analysis further showed that FAW moths originated from C4 host plants,while trajectory analyses revealed that migratory S.frugiperda adults are able to cross the South China Sea and enter China's Mainland.This long-distance migration process plausibly results in frequent genetic mixing between domestic FAW populations and those of neighboring Southeast Asian countries.Overall,this work provides unique insights into FAW migration across eastern Asia and ultimately can help advance pest forecasting,risk assessment and area-wide pest management.
基金funded by the National Natural Science Foundation of China(31901873 and 31727901)the Central Public-interest Scientific Institution Basal Research Fund,China(CAAS-ZDRW202007)。
文摘The fall armyworm(FAW),Spodoptera frugiperda(J.E.Smith),is an important agricultural pest with a strong migratory ability.While 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 region.In other regions however,the moth’s migration patterns have not yet been characterized.Here,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 simulation.The 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 species.Together,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.
