草地螟2007年越冬代成虫迁飞行为研究与虫源分析

草地螟 Loxostege sticticalis L.是危害我国北方农牧业的一种重要迁飞性害虫，明确草地螟的虫源地及迁飞路线对其早期预警具有重要意义。本文利用垂直监测昆虫雷达的长期观测，迁飞高峰期雌虫卵巢解剖、大区环流分析、各地虫情信息收集和利用Hysplit_4模型进行轨迹分析，研究了2007年越冬代草地螟的空中迁飞行为和东北地区严重暴发的草地螟虫源。结果表明：6月7–9日，雷达观测点诱虫灯内草地螟具有典型迁飞昆虫生理特征；草地螟主要在夜间迁飞，飞行高度集中在300～500 m，400 m是主要飞行高度，迁飞高峰期夜间迁移可持续9 h。东北地区严重发生的草地螟虫源，一部分来自内蒙古乌盟地区，一部分来自蒙古共和国中东部及中俄边境地区。据此推测我国与国外草地螟存在虫源交流。

The migratory behaviour and population source of the first generation of the meadow moth, Loxostege sticticalis L. (Lepidoptera: Pyralidae) in 2007

The meadow moth,Loxostege sticticalis L.,is an important farming migratory pest in North China,and the understanding of the exact overwintering area and migratory path for the pest is essential for establishing a population forecasting system.In this study,we developed a long-term monitoring observation of the pest using a vertical-looking radar(VLR),checked up the ovarian development and collected the number of meadow moths in light trap at different points during the peak migration period of meadow moth.We also analyzed the weather background during the major immigration period,especially,low altitude airflow and large-scale atomspheric circulation.Finally,we did numerical simulation on migration dynamics of meadow moth with Hysplit_-4(HYbrid Single-Particle Lagrangian Integrated Trajectory).The results showed that meadow moths during June 7-9 showed a typical physiological characteristic of migrating insects and the moths usually took advantage of strong winds to fly and formed main migrating layers at 300-500 m above ground level(agl),mainly at 400 m(agl),and lasted 9 h in one night.Part of the meadow moth population in the northeast of China immigrated from Wumeng,Inner Mongolia,and part from the middle-east part of Mongolia and the border areas of China and Russia.It is so inferred that population intercourse of the meadow moth may exist between China and neighboring countries.