灰飞虱是我国重要的农业害虫，每年因传毒危害给农业生产带来严重损失。为了有效地防控灰飞虱的暴发危害，必须采用大的空间尺度来研究灰飞虱地理种群的遗传结构和迁移扩散特性，明确地理种群之间的遗传关系。目前我国有关灰飞虱的群体遗传结构和迁移扩散尚缺乏大范围分子水平上的研究。本研究拟应用分子生态学技术和理论对灰飞虱的许多关键科学问题进行深入的研究和探讨。采用微卫星DNA和线粒体DNA标记并结合Wolbachia wsp基因的序列数据，从种群遗传学和进化学的角度对灰飞虱的种群遗传多样性、遗传结构、种群动态、种群的遗传谱系和地理分布格局以及迁移扩散进行全面系统的研究和探讨。同时通过综合分析我国和周边国家（韩国、日本和越南）灰飞虱样本的分子数据，推断灰飞虱的迁移扩散特性，同时进一步阐明灰飞虱大范围迁飞的可能性。上述科学问题的研究能为灰飞虱的综合防治提供借鉴和参考，为保障国家粮食安全提供科学依据。

The small brown planthopper, Laodelphax striatellus (Fallén), is one of the major rice pests in China. This species is known as the vectors of several kinds of virus and can cause great damage to the crop production. In order to effectively defence and control the outbreak of L. striatellus, it is necessary to investigate the population genetic structure and dispersal activity of L. striatellus at large scale area. However, there is no comprehensive molecular research about the population genetics and migration characteristics of L. striatellus in China. This project will explore many key scientific questions of L. striatellus using molecular biology technology and molecular ecology theory. The microsatellite DNA markers, mitochondrial DNA markers, and Wolbachia wsp genes will be used to study the genetic variation, population structure, population dynamics, historical demography, geography distribution pattern, dispersal and migration of L. striatellus. By further combining analysis the molecular data of L. striatellus from China and peripheral countries (Korea, Japan and Vietnam), we can deduce the dispersal activity and the possibility of long-distance migration of L. striatellus in a wide range. The resove of the above key questions can give an important aid for an integrated pest management (IPM) strategy for L. striatellus.