【摘要】 2004—2005年,在江苏沿海地区采用系统调查与面上普查相结合的方法,比较分析转Bt基因抗虫棉(中棉所44)与常规棉(中棉所17)2类棉田昆虫种群的差异。结果表明,与常规棉田相比,Bt棉田棉铃虫、玉米螟、金刚钻、棉小造桥虫等鳞翅目害虫种群数量显著降低,而盲蝽象、红蜘蛛、棉蚜、烟粉虱等非靶标刺吸式害虫种群数量显著增加;蜘蛛、瓢虫等捕食性天敌种群数量显著增加,而棉铃虫的寄生性天敌种群数量则显著下降。转Bt基因抗虫棉对棉田昆虫种群的影响在数年间保持相对稳定的状态。更多还原

【Abstract】 The insect populations in the fields of insect-resistant transgenic Bt cotton(BT) and in the fields of conventional non-transgenic cotton(CV) in the coastal agricultural region of Jiangsu Province were surveyed and systematically compared in the year of 2004—2005.Results show that the insect community structure in the Bt fields differed sharply from that in the CV fields.The populations of the Lepidopterous pests,such as cotton bollworm,corn borer,diamond bollworm and cotton leaf caterpillar,decreased significantly in the BT fields,while the populations of non-target pests with piercing-sucking mouthparts,such as leaf bugs,cotton spider mites,cotton aphids and whiteflies,increased obviously.Much more predators,such as spiders and ladybirds,and much less parasitiods of Helicoverpa armigera were observed in the BT fields.The findings of the present study and others suggest that the effects of insect-resistant transgenic Bt cotton on insect population in cotton fields were relatively steady in recent years.更多还原