玉米是晋城市的主要粮食作物之一,常年种植面积在7郾33万hm2左右。丝黑穗病是为害玉米的主要病害,近两年在晋城市的部分县(市)发生较重,如2005年在高平市普遍发生,发生面积1郾4万hm2,占播种面积的60%以上,一般地块发病率在8%～10%,严重的高达30%以上,给玉米产量造成了巨大损失 Corn is one of the main grain crops in Jincheng City, with a perennial planting area of ​​7 郾 330,000 hm2. Head smut is the main disease of maize. In recent two years, serious occurrence occurred in some counties (cities) in Jincheng City. As occurred frequently in Gaoping City in 2005, an area of ​​140,000 hm2 occurred, accounting for 60% of the sown area. Above, the general block incidence of 8% to 10%, severe up to 30%, resulting in a huge loss of corn production