甘蓝和大白菜在我省种植面积达20万亩以上,受菜青虫、小菜蛾、棉铃虫等危害十分严重,后者还蛀食番茄、菜豆等,影响产量和品质。为生产无公害蔬菜,自1983年开始,先后用湖北农科院微生物厂生产的Bt制剂[活孢量100亿个/克(毫升)]防治以上害虫,取得了较好的效果,仅张家口、保定两地区应用面积就达1.5万亩以上。 使用方法 Cabbage and cabbage in the province planted an area of ​​200000 mus of above, by cabbage caterpillar, diamondback moth, cotton bollworm and other hazards is very serious, the latter also eaten tomatoes, beans, etc., affecting yield and quality. For the production of pollution-free vegetables, since 1983, Bt preparation [living-spore amount 10 billion / g (ml)] produced by the Microbial Factory of Hubei Academy of Agricultural Sciences has been used to control pests and has achieved good results. Only Zhangjiakou, Baoding two areas of the application area of ​​up to 15,000 mu or more. Instructions