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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。
In order to clarify the occurrence of the brown planthopper (BPH) in single-double cropping rice hybrid system in Xing’an, Guangxi, the dynamics of brown planthopper (BPH) occurrence in early, middle and late paddy fields in the area were studied by light trapping and field survey. Using the HYSPLIT 4.8 In 2011, the migration of brown planthopper was carried out. The population of BPH in Xing’an area of Guangxi Province changed obviously with the seasons, with 6 generations occurring annually. The migration activities mainly concentrated in early July to early September. The occurrence of BPH coincides with the growth of single-season middle-season rice, and the occurrence of rice planthopper in single-season is the largest. In 2011, the migratory insects of Nilaparvata lugens from Xing’an, Guangxi Province, mainly came from Hainan rice areas and from the rice paddies of Thailand, Vietnam and Laos. From July to August, the insects migrated from south Guangxi, southeast and west of Guangdong. The source came from southwestern Hunan and western Jiangxi Province. In October, migratory pests mainly migrated to central Guangxi and southern Guizhou. Studies have shown that the low-level jet stream in the south direction provides the carrier airflow for the large-scale migration of brown planthopper, and rainfall is the main reason for the planthopper landing.