分月扇舟蛾是杨树主要食叶害虫之一,以幼虫取食叶片。由于繁殖力强、幼虫食量大,容易爆发成灾,能在短时间内将大面积杨树叶片吃光,严重影响杨树的生长。它分布于东北、华中、华北及江苏、青海、四川、云南等地。为害杨、柳、白桦等。分卵、幼虫、成虫、蛹四个虫态。在上海1年6～7代,湖南7代,以卵在枝干上越冬。少数以3龄幼虫在枯枝落叶中越冬,但越冬死亡率很高。越冬卵翌年4月上旬开始孵化,初孵 Branch moths are one of the main leaf-eating pests of poplar, fed on larvae. Due to the strong reproductive capacity, larvae food intake, prone to disaster, can be a large area of ​​poplar leaves in a short time, seriously affecting the growth of poplar. It is located in the northeast, central China, northern China and Jiangsu, Qinghai, Sichuan, Yunnan and other places. Damage to Yang, Liu, birch and so on. Points eggs, larvae, adults, pupa four insect state. In Shanghai 1 year 6 to 7 generations, Hunan 7 generations, with eggs in the branches of the winter. A small number of 3rd instar larvae winter in the litter, but overwintering mortality is high. Overwintering eggs in early April the following year began to hatch, first hatch