据农业部全国农技推广服务中心信息:今年,小麦和棉花等作物病虫源基数偏低,蝗虫、玉米螟等旱作物害虫冬前密度偏高。预计全国主要农作物病虫仍呈偏重发生态势。其中小麦和水稻主要病虫将中等或中等偏重发生;蝗虫、草地螟、玉米螟等害虫偏重至大发生;棉铃虫等棉花害虫发生面积下降,三、四代发生较重。另 According to the National Agricultural Technology Extension Service Center of the Ministry of Agriculture, the base number of pests and diseases of crops such as wheat and cotton is low this year. The pest insects such as locusts and corn borer have high winter density. Pests and diseases of major crops in the country are still expected to be more prevalent. Among them, the main diseases and pests of wheat and rice will be moderate or moderately heavier; pests such as locusts, meadow moths and corn borers tend to occur predominantly; the area of ​​cotton insect pests such as cotton bollworm areas decrease, and heavier in the third and fourth generation. another