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杨天杜蛾一般取食叶肉,残留叶脉,使叶枯干脱落,严重时可将叶片全部吃光,是我国十二大森林害虫之一。杨天杜蛾成虫为淡灰褐色蛾子,前翅灰白色,横生四条白纹,后翅灰白色,中央有一条色泽较深的横线。幼虫淡棕褐色,头黑褐色,体上有淡黄色细毛,背面灰黄绿色有一条棕黄色背线,两侧有灰褐宽带和一条黑色的气门上线,腹面灰绿色,每节有环状排列的橙黄色肉瘤八枚,瘤上生有长毛,腹部第一节和第八节背面各有一红褐色瘤状突起。杨天杜蛾在我区一般每年三代,10月中旬第三代老熟幼虫在落叶、树基、墙角下结茧化蛹越
Yang Tian moth generally feeding on the leaves, leaving the veins, the leaves dry off, the leaves can be severe in all light, is one of China’s 12 major forest pests. Yang Tian moth adults light gray brown moths, foregone gray, white four lines, hilt wings gray, the center has a darker horizontal line. Larvae light brown, dark brown hair, the body has a light yellow hair, the back of a yellow-green-yellow with a brown back, both sides of the gray-brown broadband and a black valve on the line, the ventral gray green, each section has a circular arrangement Of the orange-yellow sarcoma eight, had long hair on the tumor, the abdomen on the back of the first section and the eighth section of a red-brown tumor-like processes. Yang Tian moth generally in my area three generations per year, in mid-October the third generation of mature larvae in deciduous, tree-based, corner cocoon pupation under the more