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杨扇舟蛾,又名杨树天社蛾,是杨树主要的危险性害虫,危害性大,毁灭性强。幼虫取食杨树叶片,严重时把树叶吃光,影响树木生长。1-2龄幼虫仅啃食叶的下表皮,残留上表皮和叶脉;2龄以后吐丝缀叶,形成大的虫苞,白天隐伏其中,夜晚取食;3龄以后可将全叶食尽,仅剩叶柄。传播途径主要靠成虫飞翔,幼虫吐丝下垂,可随风作近距离传播。由于幼虫繁殖快、数量多、分布广,大发生时极易成灾,为我国林业重要害虫之一。
Yang Fan boat moth, also known as poplar days moth, poplar is the main risk pests, harmful, destructive. Larvae feeding poplar leaves, severe leaves when eating, affecting the growth of trees. 1-2 instar larvae only eat the lower epidermis of the leaves, leaving the epidermis and veins; after 2 years of sprouts embellished leaves, the formation of large insect buds which conceal during the day and night; 3 after the whole leaf can be exhausted Petiole remaining. The main route of transmission by adult fly, larvae shedding silk, with the wind for close-range transmission. As the larvae multiply fast, the number of large, widely distributed, when the great disaster easily occur, as one of China’s major pests of forestry.