玉米螟是我县危害玉米的主要害虫,一般年份危害率达10—20％,严重年份危害率高达40—50％。一九七三年,我们大面积用白僵菌防治玉米螟,在危害率高达47％的情况下施菌防治,取得了良好效果。具体做法是:将每克含菌量为130亿万左右孢子的白僵菌粉以1∶10或1∶20掺和湿沙子作成颗粒剂,撒于玉米喇叭口内,每亩用颗粒剂7—10斤。撒药时间7月8日,防治第一代玉米螟。试验面积75亩。在7月27日调查,1∶10和1∶20的白僵菌颗粒剂防治效果相当于或好于1∶40灵丹粉颗粒 Corn borer is the main pest that endangers corn in our county. The damage rate in general years is 10-20%, and in severe years it is as high as 40-50%. In 1973, we used Beauveria bassiana to prevent and cure corn borer in a large area, and applied the prevention and control in the case of the harm rate as high as 47%, and achieved good results. The specific method is: per gram of Beauveria bassiana powder containing about 130 billion spores of the bacterium mixed with 1:10 or 1:20 wet sand to make granules, sprinkle corn trumpet mouth with granules per acre 7- 10 pounds. Dispensing time July 8, the first generation of corn borer control. Test area of ​​75 acres. In the July 27 survey, 1:10 and 1:20 Beauveria bassiana granules control effect equivalent to or better than 1:40 lingdan powder particles