桑天牛是杨树重要蛀干害虫之一。主要危害毛白杨、桑树等,常导致毁灭性灾害。危害特点:桑天牛以幼虫蛀食树干。成虫啃食桑科植物的嫩枝皮进行补充营养。成虫产卵前先用上颚咬破毛白杨的皮层和木质部,后将卵产于刻槽中。幼虫孵化后先向上取食10毫米左右,即调头沿枝干木质部的一边往下蛀食,逐渐蛀入心材,若树干较矮小,下蛀可达根际。幼虫在蛀道内,每隔一定距离向 Morus alba is one of the major stem borers of poplar. Major hazards Populus, mulberry, etc., often lead to devastating disasters. Harm characteristics: Morus albiflorus larvae eating tree trunks. Adults eat soft branches of mulberry plants to supplement nutrition. Before laying eggs, the adult bites the cortex and xylem of Populus trichocarpa with the upper jaw, and then the egg is produced in the notch. Larvae hatch first feeding about 10 mm, that is, along the side of the trunk of the xylem down the sideways down, and gradually eroded the heartwood, if the trunk is shorter, the next moth up rhizosphere. Larvae in the tunnel, at regular intervals