玉米、高粱是我区的主要粮食作物,钻心虫和粘虫是危害玉米、高粱的主要害虫。夏玉米、高粱的心叶未期,一般在7月下旬至8月上旬,是钻心虫和第三代粘虫发生盛期。用颗粒剂防治钻心虫兼治粘虫,是经济有效,值得推广的好经验。1960年我们在用颗粒剂防治玉米螟的研究中,发现施药区粘虫发生很轻,而不施药的对照区粘虫为害很重。在室内药效测定,六龄的粘虫与5％的滴滴涕颗粒剂接触一分钟,12小时后死亡50％,24小时后死亡85％,48小时后死亡100％。而粘虫喜欢潜藏在叶鞘和心叶里,因此, Corn and sorghum are the main food crops in our region. Bore and armyworm are the major pests that endanger corn and sorghum. Summer corn, sorghum heart leaves are not expected, usually in late July to early August, is the worm and the third generation of armyworm occurrence peak. Prevention and control of worms and worms and worms with granules are cost effective and worthy of promotion. In 1960, we used the granules to prevent and control the corn borer and found that the armyworm in the application zone occurred very lightly, but the insects in the control zone had a very heavy damage. In the laboratory efficacy test, the sixth-instar armyworm was exposed to 5% DDT granules for one minute, died 50% after 12 hours, died 85% after 24 hours and died 100% after 48 hours. The armyworm like to hide in the leaf sheath and heart leaves, therefore,