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近几年，转BT基因抗虫棉花我市得到了大面积的推广。主要品种为新棉33B、荷棉3号，由于抗棉铃虫效果好，缓解了棉铃虫防治的任力，减少了防治成本和化学农药的使用量。大面积抗虫棉的种植，使棉田的生态环境发生了大的变化，这势必引起害虫种群及为害程度的变化。了解这种变化?
In recent years, BT transgenic insect-resistant cotton city has been a large area of promotion. The main varieties of new cotton 33B, Dutch cotton 3, due to the effect of anti-bollworm, alleviating the cotton bollworm prevention and control of any reduction in control costs and the use of chemical pesticides. The planting of a large area of insect-resistant cotton has greatly changed the ecological environment of the cotton field, which will inevitably cause the change of pest populations and the degree of damage. Understand this change?