Abstract:In order to clarify the occurrence regularity of brown planthopper (BPH), Nilaparvata lugens (Stål) in the single and double mixed rice systems, light traps and systematic field surveys were used to study the population dynamics of N.lugens in Xing‘an, Guangxi. The spatiotemporal distribution of source areas of N.lugens migration peaks were analyzed using HYSPLIT 4.8 (hybrid single-particle lagrangian integrated trajectory), a software package that simulates migration trajectories, during the migration periods. The results showed that the population dynamics of N.lugens varied seasonally in Xing‘an. N.lugens had six generations a year,migration occurred mainly from the early of July to the early of September. The peak period of N.lugens occurance was coincidence with the middle rice growth period. The population density of N.lugens in the middle rice field was significantly higher than those in other two rice fields. The immigrants to Xing‘an during May to June in 2011 mainly came from Hainan, Tailand, and middle of Vietnam and Laos, while the immigrants during July to August came form south and southeast of Guangxi, west of Guangdong. The autumn immigrants came from the southwest of Hunan and west of Jiangxi. In October local emigrants mainly flew to the middle of Guangxi and the south of Guizhou. Partial south low-level jets carried massive numbers of N.lugens into Xing‘an, while heavy rainfall caused mass descent.