北京地区越冬代旋幽夜蛾迁飞的虫源分析

目的研究越冬代旋幽夜蛾Scotogramma trifolii在北京地区的灯下消长动态和迁飞虫源,为其预测预报和有效防治提供依据。方法2007—2009年利用垂直监测昆虫雷达、探照灯和相关设备对旋幽夜蛾的迁飞过程开展实时监测,通过GRADS图形处理软件分析其迁飞高峰期盛行的空中风场,结合Hysplit_4软件对其迁飞轨迹进行分析,探讨北京地区越冬代旋幽夜蛾迁飞扩散的虫源。结果旋幽夜蛾迁飞高峰期,卵巢发育进度集中为2—3级,雌雄性比1,高峰期过后雌雄性比1;夜间迁飞主要集中在风向有利风速较大的300—500m高度,持续飞行时间可达8h以上;轨迹分析显示,虫源主要来自陕西、山西北部和内蒙古鄂尔多斯、呼和浩特、乌盟等中西部地区,随偏西气流向东北、东南方向迁飞扩散。结论越冬代旋幽夜蛾具有明显的迁飞现象,根据其迁飞行为进行早期监测预警具有重要意义。

Analysis on the Population Status of the Overwintering Generation of the Clover Cutworm Scotogramma trifolii (Lepidoptera: Noctuidae) in Beijing

Objective Research on the variation of light catch and population status of the clover cutworm Scotogramma trifolii (Lepidoptera: Noctuidae) was carried out in order to provide a basis for effective prevention and control of it in North China. Method Vertical-looking radar and related equipment were used to carry out real-time monitoring of the migratory process of the clover cutworm, and the prevalent airflow was analyzed by the software of GRADS during the migrating peak and the Hysplit_4 software was emp...