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2012年8月上旬,三代黏虫在我国华北北部和东北部分地区突然暴发,发生面积和为害程度为近十年罕见。中国农科院植保所、全国农技中心、吉林省农科院植保所研究人员通过探照灯的多年连续监测,结合气象因素、迁飞高峰期的天气背景分析和迁飞路线的轨迹模拟,探讨了2012年三代黏虫大发生的原因。分析结果表明:在二代已积累较高虫源量的基础上,7月中下旬华北和东北地区适宜温度和频繁降雨为二代成虫迁飞、繁殖提供了有利条件,适宜的寄主为三代幼虫取食提供了充足的食物来源,以上是导致华北和东北地区三代黏虫大发生的两个主要因素。虫源分析显示,华北北部和辽宁中西部重灾区虫源主要来自本地,部分虫源来自重灾区的周边地区,受降雨和下沉气流影响大部分集中降落华北北部和辽宁中西部地区,一部分继续迁飞进入东北地区;
In early August 2012, the third generation of armyworms suddenly broke out in northern China and parts of northeast China. The occurrence area and damage were rare in recent ten years. Researchers from Plant Protection Institute of China Academy of Agricultural Sciences, National Agricultural Technology Center and Plant Protection Institute of Jilin Academy of Agricultural Sciences, through continuous monitoring of searchlights for many years, combined with meteorological factors, weather background during the peak of migration and trajectory simulation of relocation routes, 2012 three generations of large-scale occurrence of sticky worms. The results showed that suitable temperature and frequent rainfall in the north and northeastern regions in late July provided advantageous conditions for the migration and reproduction of the second generation adults. The suitable hosts for the third generation larvae Feeding provided sufficient food sources, the above is the two major factors that led to the third generation of armyworm in northern and northeastern regions. Insect source analysis showed that most of the insect pests in northern North China and central and western Liaoning were mainly from the locality, and some of the insect pests came from the surrounding areas of the hardest hit areas. Most of them were mainly concentrated in the northern part of North China and central and western Liaoning Province, partly continued Fly into the northeast region;