杨小舟蛾(Micromelalopha troglodyta(Graeser)在湖南欧美杨栽培区发生严重,是主要食叶害虫之一,为有效地进行防治,我们对其进行了观察。杨小舟蛾各个世代发生程度有差别,发生量大,为害重的是第3代和第4代幼虫,尤其第4代特别严重,时间是7、8两月:第1.2代幼虫常被一种病毒感染,大量死亡,为害很轻:第5、6两代发生亦不严重,与8月份曾喷药防治,虫口密度降低有关。幼虫孵化后,群集在叶片上啃食表皮,使之成罗网状,稍大分散为害,将叶片吃成缺刻,残留叶脉和和叶柄,7-8月严重发生后,60-80％的叶片被 Micromelalopha troglodyta (Graeser) is one of the major leaf-feeding pests in the poplar cultivation area of ​​Europe and North America, and we observed it in order to effectively prevent and control it. Large amount of damage is the third and fourth generation larvae, especially the fourth generation is particularly serious, the time is 7,8 two months: the first generation of larvae are often a virus infection, a large number of deaths, the damage is very light: the first 5,6 two generation is not serious, and in August had spray control, insect density reduction related to larvae hatch, the cluster gnawing the epidermis on the leaves, making it into a reticular, slightly dispersed damage, the leaves eat Notch, residual veins and petiole, 7-8 months after severe occurrence, 60-80% of the leaves were