7月18～20日,全国农技中心在内蒙古呼和浩特市召开了秋蝗草地螟和玉米中后期病虫害发生趋势会商会。分析预计今年玉米中后期病虫害总体为中等发生,发生程度与上年持平,发生面积大于上年,虫害重于病害;8月底前为各种病虫为害高峰 July 18 ~ 20, the National Agricultural Technology Center in Hohhot, Inner Mongolia Autumn Walker Grasshopper and maize pests and diseases occurred in the mid-late Chamber of Commerce. It is estimated that pests and diseases in mid and late maize will generally occur moderately in this year and the occurrence level is the same as that in the previous year. The area of ​​occurrence is larger than that of last year. The pests are heavier than the diseases. The peak of pests and diseases before the end of August