Researchers have introduced specific genes into crops through genetic engineering technology, so that they can encode and synthesize Bt toxic protein, which can kill invasive pests. Transgenic Bt cotton is widely planted in a place, which effectively controls the harm of cotton bollworm, but at the same time, another pest, blind Toona sinensis, is rampant. 
The ailanthus sinensis generally moved into the cotton field from other hosts in the first and middle of June, which is the control period of the second generation of cotton bollworm
 the researchers believe that the proliferation of blind Toona sinensis is not caused by transgenic Bt cotton, But because the local climate is more suitable for the growth of blind Ailanthus sinensis.