利用化学药剂防治菜青虫,虽是重要手段,但它具有一定的毒性,尤其在生食瓜果和一些蔬菜上喷洒,如果使用的时季和剂量不妥,最易产生药害,对人畜亦有一定影响。近年来,国内在探索用微生物防治蔬菜害虫方面开展了不少工作。实践证明,生物防治对一些害虫具有特定的效果,且对人畜安全。为了进一步探讨苏芸金杆菌肯尼亚变种,对杀灭菜青虫的效果与推广使用价值,于1985年7月中旬在山西省农科院经济作物 The use of chemical agents to control Pieris rapae, though it is an important means, but it has some toxicity, especially in the raw food and some vegetables on the spray, if the season and dosage is wrong, most likely to produce phytoextracts, also have on human and livestock Certainly affected. In recent years, many efforts have been made to explore the use of microorganisms to control vegetable pests. Practice has proved that biological control has certain effects on some pests and is safe to human beings and animals. In order to further explore the effects of the Bacillus thuringiensis strain of Kenyan on the killing effect of Pieris rapae and its promotion and use value in mid-July 1985 at the Shanxi Academy of Agricultural Sciences cash crop