川东地区白背飞虱迁入种群虫源地分布与降落机制

【目的】本研究旨在确定四川达州白背飞虱Sogatella furcifera(Horváth)迁入虫源地及其降落机制,以期为川东地区白背飞虱预警和有效防控提供依据。【方法】运用大气质点轨迹分析平台HYSPLIT4.8对1991-2013年达州灯下白背飞虱主要迁入高峰日进行轨迹模拟,并运用气象图形处理软件Grads对主要迁入高峰日进行气象背景分析。【结果】达州白背飞虱主要在6-7月迁入,7月份是迁入高峰期。6月虫源主要来自广西西北、中部地区;7月虫源主要来自贵州中西部、北部,广西西北部和云南东北部也可提供部分虫源。【结论】四川达州白背飞虱迁入虫源主要来自贵州大部,部分来自云南东北部和广西西北部。由于气候条件和地形胁迫引起的降水、垂直气流和风向切变是白背飞虱大规模集中降落的主要原因。

Source areas and landing mechanisms of the immigration populations of the white-backed planthopper,Sogatella furcifera (Hemiptera: Delphacidae) in eastern Sichuan,southwestern China

【Aim】 This study aims to determine the source areas and the landing mechanisms of the immigration populations of the white-backed planthopper (WBPH), Sogatella furcifera (Horváth), in Dazhou, Sichuan Province, so as to provide a basis for the warning and effective control of this pest in eastern Sichuan, southwestern China. 【Methods】 Based on the data of the daily light-trap catches of S. furcifera in Dazhou from 1991 to 2013, the trajectory simulation and the meteorological background of immigration peaks of S. furcifera were analyzed by HYSPLIT 4.8 (Hybrid Single-Partical Langrangian Integrated Trajectory) and GRADS (Grid Analysis and Display System). 【Results】 The main immigration period of S. furcifera in Dazhou was from June to July, with a peak season in July. The mass immigration of S. furcifera into Dazhou in June was from the northwest and the central of Guangxi. In July, the major source areas were the central, west and north of Guizhou, and the secondary source areas were the northwest of Guangxi and the northeast of Yunnan. 【Conclusion】 The source areas of the immigration of S. furcifera in Dazhou of Sichuan province are located mainly in Guizhou, and partly in the northeast of Yunnan and the northwest of Guangxi. Due to the climate conditions and terrain stress precipitation, vertical airflow and wind shear are the main causes of large-scale landing of S. furcifera.