赣东地区水稻改革以来,紫云英种植面积逐年扩大,虫害也逐渐增多。苜蓿蚜(Aphis medicaginis Koch)就是本地区紫云英当前重要害虫之一,发生面积很大。一般的田百株蚜数在2,000-6,000只之间。紫云英受害之后,生长极为缓慢,产生卷叶萎缩等现象,妨碍 Since rice reform in the eastern part of Gansu, the area planted with milk vetch leaves has been expanding year by year, and insect pests have gradually increased. Aphis medicaginis Koch is one of the most important pests of the genus Astragalus in this region, and it is very large in area. The average field hundred plants aphids in the number between 2,000-6,000. After the injury of the milk vetch, the growth is extremely slow, resulting in the phenomenon of curly leaf atrophy, hinder