最近，中国农科院植保所研究员郭子元对棉令虫大发生的主要原因进行了分析，得出以下几条基本结论：一是气候干旱是棉铃虫大发生的主要环境条件；二是施肥水平，特别是施氮量的日益g高，成为棉铃虫在棉田严重性上升的主要物质基础；三是不合理使用化学农药是造成棉铃虫种群失控 Recently, Guo Ziyuan, a researcher at the Institute of Plant Protection of Chinese Academy of Agricultural Sciences, analyzed the major causes of cotton insects and found the following basic conclusions: First, climate drought is the major environmental condition for occurrence of cotton bollworm; second is the level of fertilization, In particular, the application of nitrogen is increasingly high g, a bollworm in cotton serious increase in the material base; Third, unreasonable use of chemical pesticides is causing cotton bollworm population out of control