Bacillus thuringiensis(Bt)杀虫晶体蛋白能够通过喷雾或者转基因地方式有效地防治许多害虫种类,害虫的抗性发展可能对Bt的长期使用存在风险。一种延缓害虫对Bt抗性的方法是在作物中转入能够结合到昆虫中肠不同受体的两种或者更多的Bt基因,Bt棉花(Gossypium hirsutum L.)中转入基因为Cry1 Ac和Cry2Ab的转基因棉能够有效防治许多重要的鳞翅目害虫,包括甜菜夜蛾,它是大部分蔬菜上面具有迁移性的害虫,而且在棉花上成为越来越重要的种类之一。在包括甜菜夜蛾在内的许多鳞翅目害虫中钙 Bacillus thuringiensis (Bt) insecticidal crystal proteins are effective in controlling many pest species by spraying or transgenes, and the development of pest resistance may pose a risk to the long-term use of Bt. One approach to slow pest resistance to Bt is to transfer two or more Bt genes in plants that bind to different receptors in the midgut of insects and Bt genes in cotton Bt cotton (Gossypium hirsutum L.) The transgenic cotton with Cry2Ab is effective in controlling many important lepidopteran pests, including beet armyworm, which is a pest that migrates on most vegetables and is one of the more important species on cotton. Many lepidopteran pests include beet armyworm calcium