当前,草地螟已进入1996年以来第3个暴发周期。农业部全国越冬虫源统一调查结果显示,2008年夏秋之际1代草地螟成虫在内蒙古、河北等地大面积暴发,部分成虫入侵北京市,且越冬虫茧分布范围广,活茧面积近670万公顷。尤其是北京周边地区越冬虫茧密度较高,最高每米2虫茧达568头,预计 Grasshopper has now entered its third outbreak since 1996. According to the results of a unified survey of overwintering insect pests in the Ministry of Agriculture, the first generation of grass borers broke out in large scale in Inner Mongolia and Hebei in the summer and autumn of 2008, some of them invaded Beijing, and the overwintering cocoon was distributed in a wide range with a live cocoon area of ​​nearly 670 Ten thousand hectares. In particular, the density of overwintering cocoon in Beijing’s surrounding areas is high, reaching a maximum of 568 cocoon per meter, which is estimated