粘虫 Mythimna separata(Walker)是我国粮食作物上的重要害虫。目前关于粘虫发生趋势预报,以小尺度短期预报为多,大尺度长期预报尚不多见。因此,准确作出二代粘虫发生趋势长期预报,对指导中、短期预报及防治准备工作有重要的现实意义。研究方法预报对象大尺度和小尺度两类。以我国 Mythimna separata (Walker) is an important pest on food crops in our country. At present, the trend forecast of armyworm occurrence is based on the short-term forecast of small-scale and long-term large-scale forecast is rare. Therefore, to accurately make the second-generation long-term trend of armyworm occurrence trend has important practical significance in guiding short-term and forecasting and prevention and control work. Research methods predict the object of large-scale and small-scale two categories. In my country