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应用改进的常规育种技术培育转Ｂｔ基因抗虫棉，可大大提高对鳞翅目害虫的抗性，这是棉花品种改良的新趋势。育种实践表明，根据转Ｂｔ基因种质系供体的特点和遗传缺陷，选择综合性状优良、前期生长势强、株形稍高大松散，铃重较大、生育期相对较短的材料作亲本较为适宜；在杂交技术的应用上，宜采用复合杂交、基因渐渗和有利基因累加技术；杂种后代的处理视杂交方式而定。本文对育种程序中抗虫性鉴定技术进行了讨论。
The application of improved conventional breeding techniques to develop transgenic Bt cotton can greatly improve the resistance of lepidopteran pests, which is a new trend of cotton varieties improved. Breeding practice shows that according to the characteristics and genetic defects of Bt transgenic lines, we selected the parents with good comprehensive characters, strong growth in the early stage, slightly bulky plant shape, larger boll weight and relatively short growing period Suitable; Hybridization technology, should adopt the hybridization, gene introgression and favorable gene accumulation technology; Hybrid offspring treatment depending on hybridization mode. This article discusses the identification of insect resistance in breeding programs.