玉米是宁晋县的主要粮食作物,玉米种植面积约占全县耕地面积的70%。2003年以来,瑞典蝇在本县玉米田严重发生。严重发生田块玉米产量损失达15%～25%。2006年夏玉米苗期,一般虫株率5%～10%,严重田块达50%左右。主要为害品种是浚单2和郑单958,其中浚单20最严重。瑞典蝇成虫将卵产 Corn is the main food crops in Ningjin County, corn planting area accounts for about 70% of the county’s arable land. Since 2003, Swedish flies have been seriously affected in this county cornfield. A serious crop of corn yield loss of 15% to 25%. 2006 summer maize seedling stage, the general worm plant rate of 5% to 10%, a serious block up to 50%. The main damage varieties are Xundan 2 and Zhengdan 958, of which Xundan 20 is the most serious. Swedish fly adults produce eggs