菜青虫是兰州地区蔬菜上的重要害虫,从春季开始发生,以秋季为害最重。为了更好地将我市生物防治工作开展起来,生产更多无残毒的蔬菜,从1981年以来,在大面积使用“7216”防治的基础上,我们又先后引进B.T微生物农药、青虫菌、杀螟杆菌、7701、菜青虫颗粒体病毒进行了防治菜青虫试验,从中筛选出对菜青虫有强烈毒杀作用的B.T微生物农药。1982年B.T粉剂示范面积为5000多亩。1983年,在省植保站的支持和帮助下,我站在 Pieris rapae is an important vegetable in Lanzhou area pests, from the beginning of the spring to fall the most damage. In order to better carry out biological control in our city to produce more vegetables without residue, since 1981, on the basis of large-scale use of “7216” prevention and control, we have successively introduced BT microbial pesticides, caterpillar fungus, killing Bb, 7701 and Pieris rapae were tested against Pieris rapae, and BT microbe pesticides with strong toxic effects on Pieris rapae were screened out. 1982 B.T powder demonstration area of ​​5000 mu. In 1983, with the support and help of the Provincial Plant Protection Station, I stood