广西兴安地区褐飞虱发生动态及迁飞轨迹分析

为明确广西兴安地区单双季稻混作模式下褐飞虱发生规律,采用灯光诱捕和田间系统调查的方法研究了该地区早、中、晚稻田褐飞虱发生动态,并运用大气质点轨迹分析平台HYSPLIT 4.8对2011年褐飞虱迁飞高峰进行了迁飞轨迹分析。广西兴安地区褐飞虱种群数量随季节变化明显,年发生6代,迁飞活动主要集中在7月上旬至9月上旬。褐飞虱发生高峰期与单季中稻生长期吻合,在单季中稻田的发生量最大。2011年广西兴安褐飞虱5—6月迁入虫源主要来自海南稻区以及泰国、越南和老挝中部稻区;7—8月迁入虫源来自广西南部、东南部和广东西部稻区;回迁虫源来自湖南西南部和江西西部;10月从本地迁出的虫群主要迁向广西中部和贵州南部。研究表明,偏南方向的低空急流为褐飞虱的大规模迁入提供了运载气流,降雨是迫使稻飞虱降落的主要原因。

Occurrence dynamics and trajectory analysis of Nilaparvata lugens in Xing'an, Guangxi

In order to clarify the occurrence regularity of brown planthopper (BPH), Nilaparvata lugens (Stål) in the single and double mixed rice systems, light traps and systematic field surveys were used to study the population dynamics of N.lugens in Xing'an, Guangxi. The spatiotemporal distribution of source areas of N.lugens migration peaks were analyzed using HYSPLIT 4.8 (hybrid single-particle lagrangian integrated trajectory), a software package that simulates migration trajectories, during the migration periods. The results showed that the population dynamics of N.lugens varied seasonally in Xing'an. N.lugens had six generations a year,migration occurred mainly from the early of July to the early of September. The peak period of N.lugens occurance was coincidence with the middle rice growth period. The population density of N.lugens in the middle rice field was significantly higher than those in other two rice fields. The immigrants to Xing'an during May to June in 2011 mainly came from Hainan, Tailand, and middle of Vietnam and Laos, while the immigrants during July to August came form south and southeast of Guangxi, west of Guangdong. The autumn immigrants came from the southwest of Hunan and west of Jiangxi. In October local emigrants mainly flew to the middle of Guangxi and the south of Guizhou. Partial south low-level jets carried massive numbers of N.lugens into Xing'an, while heavy rainfall caused mass descent.