Migration of the 7thgeneration of brown planthopper in northeastern Guangxi Zhuang Autonomous Region, and analysis of source areas

Brown planthopper ( BPH), Nilaparvata lugens( St覽l), is one of the most important migratory rice pests in China. The northeast of Guangxi Zhuang Autonomous Region, which is not an overwintering area for BPH, is situated in a double鄄cropping rice region and is near the “Xiang鄄gui Corridor冶, the major pathway for the seasonal northward and return migration of BPH in China. In recent years, infestations of the 7 th generation of BPH, which is regarded as a secondary devastating generation, have frequently broken out in this region, leading to higher production costs and a serious loss of rice yield for farmers. The migration of BPH to China in spring has increased with the increased backward migration of BPH towards the Indo鄄China Peninsula during the previous autumn. However, research on the migratory patterns of the 7 th generation of BPH is seldom reported. An investigation into the migrating and source areas of this generation has been initiated as a first step towards developing procedures for forecasting and suppressing significant infestations of BPH. Our studies were conducted between 2007 and 2010 in Xing忆an county, northeastern Guangxi Zhuang Autonomous Region, with

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