（1南京农业大学昆虫学系，农作物生物灾害综合治理教育部和农业部重点实验室南京210095；
2云南省农业科学院农业环境资源研究所昆明650205）摘要2008年2月，我国南方和越南北方普遍遭遇了罕见的低温冻害，褐飞虱Nilaparvata lugens (Stl)与白背飞虱Sogatella furcifera（Horváth）越冬虫量大大减少，而广西北部湾稻区在3—4月却出现了大规模的稻飞虱迁入峰。结合2008年越冬考察、灯下监测以及田间系统调查结果，通过HYSPLIT模型与GrADS软件对此阶段出现的稻飞虱大规模迁入过程进行轨迹模拟与天气学背景分析，得出以下结论：(1) 2008年广西早期迁入稻飞虱虫源与越南北部虫源关系不大，主要来自越南中部及老挝南部； (2) 850 hPa高空温度较高，低空急流频繁，以及过早出现的台风是造成钦州4月份稻飞虱大规模远距离迁入的最主要原因。因此，除越南北部红河三角洲地区外，为我国华南稻区提供早期迁入虫源的越南中部稻区更值得关注。
关键词虫源地，轨迹分析，降落机制，褐飞虱，白背飞虱

Analysis on the early immigration of rice planthoppers in
southern Guangxi in 2008 SHEN HuiMei1,2**CHEN Xiao1HU Gao1CHENG XiaNian1
ZHANG XiaoXi1ZHAI BaoPing1**
（1Department of Entomology, Nanjing Agricultural University, Key Laboratory of Integrated Management of Crop Diseases and
Pests (Ministry of Education, Ministry of Agriculture), Nanjing210095, China;  2Institute of Environmental Resources,
Yunnan Academy of Agricultural Sciences, Kunming650205, China）

AbstractSouthern China experienced unusually cold conditions in February 2008 which caused an obvious decline in the number of brown planthoppers (BPH, Nilaparvata lugens (Stl)) and whitebacked planthoppers (WBPH, Sogatella furcifera（Horváth）) overwintering in the region. However, mass immigration of WBPH occurred in late March and April 2008 in the Guangxi Zhuang Autonomous Region. Based on the analysis of daily lighttrap catches, field surveys, overwintering, immigration trajectory simulation and meteorological background analysis, the following conclusions can be drawn: (1) The main source areas of the early immigration of WBPH into Qinzhou in 2008 were in central Vietnam and southern Laos, with very few sites in northern Vietnam. (2) High temperature at 850 hPa, lower level jet stream winds and premature typhoons were the key factors affecting the settlment of both BPH and WBPH in Qinzhou. Therefore, central as well as northern Vietnam must be regarded as potential sourced of rice planthoppers in southern China.
Key wordssource areas, trajectory analysis, landing mechanism, Nilaparvata lugens, Sogatella furcifera