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通过分析2008年我国东北、华北草地螟越冬虫茧分布范围广、虫茧密度大和虫茧冬前存活率高等特点,断定今年草地螟越冬虫量为1996年第3暴发周期以来最高的年份,已具备2009年1代草地螟大发生的虫源基数;结合气候情况判断,2009年草地螟1代幼虫华北和黑龙江大部有大发生趋势。由此提出及时做好草地螟动态系统监测和预报及1代草地螟防控准备工作等建议。
By analyzing the distribution characteristics of overwintering cocoon, the density of insect cocoon and the pre-winter survival rate of grasshoppers in Northeast China and North China, the overwintering insect population of this year was the highest since the third outbreak in 1996, With 2009 first generation grass borer occurrence of insect cardinal number; combined with the climatic conditions to judge, in 2009 the first generation larvae of the grass-leaf borer in North China and Heilongjiang have a large trend. It is suggested that timely monitoring and forecasting of the dynamic system of grasshopper and preparation and prevention and control of grasshopper of the first generation should be made.