Analysis of the migration path and source areas of fall armyworm Spodoptera frugiperda in Hunan Province in 2021
To better understand the migration routes and source areas of fall armyworm Spodoptera fru-giperda in Hunan Province in 2021,the HYSPILT analysis platform was utilized to simulate the migra-tion trajectory of the species.Additionally,the NCAR Command Language(NCL)was employed to an-alyze the weather conditions during migration based on the data obtained from vertical-pointing search-light-traps and sex pheromone traps across 60 counties,cities,and districts in Hunan Province in 2021.The results showed that S.frugiperda initially migrated into southwestern Hunan Province(Huaihua City)in late March 2021,and subsequently,a large scale invasion occurred from late April to mid-May.S.frugiperda utilized three migration pathways to enter Hunan Province:west,middle,and east.The main source areas of insects were identified as Guizhou Province for the western route,Guangxi Zhuang Autonomous Region for the middle route,and Guangdong Province for the eastern route.The overall migration path of S.frugiperda in Hunan proceeded from southwest to northeast,terminating in the coastal areas of Jiangsu Province.Combined with the analysis of migration trajectory and horizontal wind fields,it was found that the carrier airflow facilitated by tropical and subtropical warm and humid airflow from the eastern Pacific Ocean and the Bay of Bengal played a key factor in the successful im-migration of S.frugiperda into Hunan.In 2021,the migration path of S.frugiperda in Hunan was pre-dominantly from southwest to northeast,with the major source populations located in Guizhou Province and Guangxi Zhuang Autonomous Region,while a smaller portion originated from Guangdong Province.
Spodoptera frugiperdamigration routestrajectory analysissource area
万方数据
维普
