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本文分析了欧美发达国家Ｂｔ生物杀虫剂由“缓慢发展”到市场复苏的主要原因，指出我国Ｂｔ生物农药的应用要走出目前的低谷，同样需要加强其实用化研究。作者在这方面的研究结果表明，以Ｂｔ为主原料的抑虫琳制剂对甜菜夜蛾等夜蛾科害虫有效防治期已从原Ｂｔ制剂的幼虫初孵阶段扩大到幼虫２～４龄范围，持效期由３～５ｄ扩大到７～１０ｄ，防效９０％左右，实用性大大提高；稻螟Ｂｔ等也有了较为实用的市场。
This paper analyzes the main reasons for the “slow development” of Bt biocides in the developed countries in Europe and the United States and points out that the application of Bt bio-pesticides in our country needs to go out of the current trough. It is also necessary to strengthen its practical research. The author’s research results in this aspect show that the effective control period of the insecticide for inhibiting beet armyworm, such as beet armyworm, from the initial stage of larvae of the original Bt preparation to larvae in the range of 2 to 4 years, Persistence period from 3 ~ 5d expanded to 7 ~ 10d, control efficiency of about 90%, greatly increased the practicability; rice borer Bt also has a more practical market.