关键词: 褐飞虱, 毫米波扫描昆虫雷达, 迁飞, 回迁, 轨迹分析

Abstract:

The brown planthopper (Nilaparvata lugens) is one of the most serious pests of rice. Studying its migration and spread can provide a scientific basis for forecast and effective control. In this study, we developed a long term monitoring observation of the migration of the brown planthopper using a millimeter-wave scanning radar, trapped the brown planthoppers of high altitude and the ground with the searchlight trap and the Jiaduo light trap from 27 April to 11 October, 2009 in Xing’an radar station, Guangxi, checked up the ovarian development of the brown planthoppers in the searchlight trap, and then the autumn return migration and source areas of the brown planthoppers were analyzed with Hysplit_4 (Hybrid SingleParticle Lagrangian Integrated Trajectory) and large-scale atmospheric circulation. The results showed that there was a return migration peak during 28 September to 7 October. The hightest daily number of brown planthoppers trapped (13 620 specimens) by the searchlight was on 1 October. The ovarian development of the brown planthoppers was mainly in grade 1 or 2. There was a dense layer which formed at heights between about 600-1 100 m above the ground level. The trajectory analysis showed that the brown planthoppers of the autumn return migration mainly came from Hengyang and Yongzhou in Hunan and were likely to continue to immigrate to Liuzhou, Nanning and Chongzuo in Guangxi by the northeast airstream. There was coincidence between trajectory analysis and the fact. The study ascertained the autumn return migration altitude of the brown planthoppers and laid the foundation of the millimeterwave scanning radar in the use of forecasting the brown planthopper and provided necessary technical support to construct early warning system in China.

Key words: Brown planthopper (Nilaparvata lugens), millimeter-wave scanning radar, migration, return migration, trajectory analysis