酒泉市棉铃虫一年发生 3～ 4代 ,从 4月下旬开始出现越冬代成虫 ,1、2代发蛾盛期分别为 6月底— 7月上旬和 7月下旬 ,从 8月底开始至 1 0月上中旬化蛹越冬。其寄主作物主要为玉米、豌豆、棉花、番茄、向日葵、大麻 ,其中棉花上主要以 2代幼虫危害为主。在 2 5 .6℃时 ,人工饲养条件下 ,卵期、幼虫期、预蛹期、蛹期、成虫期分别为 4.7、 1 4.1、 1 .5、 9.62、 6.2 d,整个世代历期 36d The cotton bollworm in Jiuquan city occurs 3 to 4 generations a year, beginning with the overwintering generation adults in late April. The first and second generation moths are the end of June-early July and late July, respectively, from the end of August to the beginning of 10 Mid-month pupation overwintering. The host crops are mainly corn, peas, cotton, tomato, sunflower and marijuana, of which cotton is mainly harmed by the 2nd generation larvae. At 2.56 ℃, the egg, larval, pre-pupal, pupal and adult stages were 4.7, 4.1.1, 1.5, 9.62 and 6.2 days respectively under the artificial feeding conditions,