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. 
During the cotton growing period, the climate conditions in this area are also conducive to the growth of cotton aphids, ground tigers, red spiders and other pests
 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.