Abstract: 【Aim】 This study aims to determine the source areas and the landing mechanisms of the immigration populations of the white-backed planthopper (WBPH), Sogatella furcifera (Horváth), in Dazhou, Sichuan Province, so as to provide a basis for the warning and effective control of this pest in eastern Sichuan, southwestern China. 【Methods】 Based on the data of the daily light-trap catches of S. furcifera in Dazhou from 1991 to 2013, the trajectory simulation and the meteorological background of immigration peaks of S. furcifera were analyzed by HYSPLIT 4.8 (Hybrid Single-Partical Langrangian Integrated Trajectory) and GRADS (Grid Analysis and Display System). 【Results】 The main immigration period of S. furcifera in Dazhou was from June to July, with a peak season in July. The mass immigration of S. furcifera into Dazhou in June was from the northwest and the central of Guangxi. In July, the major source areas were the central, west and north of Guizhou, and the secondary source areas were the northwest of Guangxi and the northeast of Yunnan. 【Conclusion】 The source areas of the immigration of S. furcifera in Dazhou of Sichuan province are located mainly in Guizhou, and partly in the northeast of Yunnan and the northwest of Guangxi. Due to the climate conditions and terrain stress precipitation, vertical airflow and wind shear are the main causes of large-scale landing of S. furcifera.

Key words: Sogatella furcifera, migration, source area, landing, immigration, trajectory simulation, eastern Sichuan