棉蚜是甘肃棉区的优势害虫，主要是棉花成株期的夏型棉蚜（即伏蚜）对棉花造成为害。为探明河西走廊棉区棉花伏蚜的为害损失和防治指标，笔者于１９９５～１９９６年在甘肃敦煌和安西两地对其进行了初步研究。研究结果表明，棉株受伏蚜为害后主要是造成株高降低、蕾铃脱落率增加、吐絮数减少，铃重降低而减产。根据甘肃河西走廊棉区的棉花生产现状，提出棉田夏型棉蚜（伏蚜）的防治指标为平均单株３片叶蚜量５０头左右。 Cotton aphid is the predominant pest in the cotton area of ​​Gansu, mainly the summer cotton-type aphid (that is, the aphid) in the cotton adult stage is harmful to the cotton. In order to find out the damage loss and control index of cotton aphid in cotton area of ​​Hexi Corridor, the author conducted a preliminary study on Dunhuang and Anxi in Gansu from 1995 to 1996. The results showed that cotton plants were mainly affected by Aphis gossypii after the plant height was reduced, the bud loss rate was increased, the number of bolls was reduced, and the boll weight was reduced and the yield was reduced. According to the status quo of cotton production in Gansu Hexi Corridor cotton area, the control index of summer type cotton aphid (Aphis gossypii) in cotton field is that the average number of three aphids per plant is about 50.