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分月扇舟蛾分布于东北、内蒙古、河北、江苏、湖北、广西、广东、四川及云南等省区,为害多种杨、柳树叶。1992年围场大面积发生,并且迅速蔓延,到1993年已发生1066公顷。主要为害小青杨、北京杨、山杨,有时将行道树、农田防护林杨树叶全部吃光,严重影响林木正常生长。一、发生规律分月扇舟蛾一年发生2代,以幼虫越冬。越冬幼虫从5月上旬开始上树,自下而上取食,危害期一个月左右。6月上旬老熟幼虫在树上吐丝结茧化蛹,6月中旬羽化。产卵于叶背面,成块状,每块粒数50—900粒。第一代幼虫从6月下旬开始出现,8月中旬产生第二代幼虫,8月下旬2龄幼虫在树缝内、树洞里、树基周围越冬。
Divided on the monthly Archipelagic moths in the northeast, Inner Mongolia, Hebei, Jiangsu, Hubei, Guangxi, Guangdong, Sichuan and Yunnan provinces, damage to a variety of poplar, willow leaves. The paddock occurred on a large scale in 1992 and rapidly spread to 1066 hectares by 1993. The main damage Xiaoqing Yang, Beijing Yang, aspen, and sometimes the road trees, farm shelterbelts poplar leaves all eaten, seriously affecting the normal growth of trees. First, the occurrence of sub-monthly marine moths occur 2 generations a year, with larvae overwintering. Overwintering larvae start on the tree from early May, bottom-up feeding, damage period of about a month. In early June mature larvae sprout cocoon pupation in the tree, emergence in mid-June. Spawning on the back of the leaves, into lumps, each particle number 50-900 tablets. The first generation larvae began to emerge in late June, the second generation larvae occurred in mid-August, and the second instar larvae in late August were in the crevices of trees, in the tree caves, and wintering around tree bases.