棉花生长中后期是营养生长和生殖生长都旺盛生长阶段,也是棉花产量形成的关键时期。而此期多高温多雨天气,以致于棉铃虫、棉盲蝽、棉叶螨、伏蚜、枯萎病、黄萎病和铃期病害等发生严重。如不及时防治,就会严重影响棉株生长发育,引起蕾铃大量脱落,造成减产。因此,必须加强病虫监测,抓住有利时机,及时进行病虫害综合防治,以确保棉花丰产丰收。一、农业措施棉花生长中后期要加强肥水管理,培育健壮植株,提高棉株抗逆性。农事上可结合整枝、打 Cotton growth in the late vegetative and reproductive growth are vigorous growth stage, but also a key period in the formation of cotton production. And this period of hot and rainy weather, resulting in bollworm, cotton laceworm, cotton spider mite, aphids, Fusarium wilt, Verticillium wilt and bell disease serious occurrence. If not timely control, it will seriously affect the growth and development of cotton plants, causing a large number of fall off the bell, resulting in reduced production. Therefore, we must strengthen the monitoring of pests and diseases, seize the favorable opportunity, and timely comprehensive prevention and control of pests and diseases in order to ensure a good harvest of cotton. First, the agricultural measures Cotton growth in the late to strengthen fertilizer and water management, nurturing robust plants, improve cotton plant resistance. Agriculture can be combined with pruning, playing