The effect of typhoons on the migration patterns of the brown planthopper in the summer of 2012
Author of the article:SHI Jin-Jian1 CHEN Xiao1 LU Ming-Hong2 ZHANG Guo1 YANG Hai-Bo1HU Gao1 ZHAI Bao-Ping1**
Author's Workplace：1. Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of IntegratedManagement of Crop Diseases and Insect Pests, Ministry of Education and Ministry of Agriculture of China, Nanjing 210095, China;2. National Agricultural Technical Extension and Service Center, Beijing 100125, China
Key Words：brown planthopper, typhoon, trajectory analysis, migratory dynamics
Abstract： [Objectives] To understand the effects of successive typhoons on the migration dynamics of the brown planthopper in order to provide useful information for inter-regional forecasting. [Methods] The influence of successive typhoons (1208 Vicente, 1209 Saola and 1211 Haikui) in the summer of 2012 on the migration patterns of brown planthopper (BPH) Nilaparvata lugens (Stål) were studied by trajectory analysis based on light-trap data and NCEP-NCAR reanalysis of data with GrADS and HYSPLIT. [Results] The synoptic wind fields and rain belt in eastern Chinabecame unfavorable to the northward migration of BPH when typhoons were approaching and had made landfall. The northward migration passage of the hoppers was broken by the prevailing northeasterly or easterly winds during the typhoons’ passage, and the fifth northward migration of BPH was obstructed by the continuous strong rainfall, windshear and sinking vertical airflow, even though southerly winds were temporarily re-established after the typhoon had passed. [Conclusion] The fifth northward migration process of BPH in 2012 was retarded by unusual typhoon weather. This mitigated the expected serious damage to rice crops in the mid and lowerYangtzeRiver basin. The wind fields and rain belt distribution in easternChinaduring July and early August will probably be a useful index for forecasting BPH damage in the mid and lowerYangtzeRiver basin.