桑天牛在河南省各地均有发生,它不仅危害桑树、柳树、槐树、白杨,还危害苹果、桃、枣、梨等一些经济树种,是为害枝干的主要害虫 一、危害状:桑天牛幼虫、成虫均为害枝干。幼虫在枝干内向下蛀食,每隔一定距离,向下蛀一排泄孔,在最下面的排泄孔排出新鲜木屑状排泄物。被害树木生长不良,易衰老,严重的整株死亡。成虫常常是咬断新枝,或将皮层咬成不规则的破碎伤口,一旦咬成 Morus alba in Henan Province have occurred all over, it not only endanger mulberry, willow, Ash, poplar, but also endanger apples, peaches, jujube, pear and some other economic species, is the main pest damage to the branch, the hazard: Mulberry Celastrus larvae, adults are harmful branches. The larvae eaten downwardly within the stems and, at regular intervals, mowed a drain hole and discharged fresh sawdust excrement in the lower drain hole. Bad growth of the trees, aging, serious death of the whole plant. Adults often bite new branches, or cortical bites into irregular broken wounds, once bite