天牛是树木的主要害虫。它以幼虫钻入树干皮层和木质部危害,在啃食的同时,用木屑、粪便堵塞蛀道。因此,人们很难确定它所处的位置,防治较为困难。近年来,广东省荷塘林场知识青年摸索出了一种简单有效的防治方法:他们用普通胸腔听诊器为树木听诊,根据蛀虫取食时发出的声响,迅速、准确地判定它的位置,然后用铁锥深刺,或用空心锥灌施 Celastrus is a major pest of trees. It larvae into the cortex and xylem endangered, grazing at the same time, the use of sawdust, manure blocking the tunnel. Therefore, it is difficult to determine its location, prevention and control more difficult. In recent years, knowledge-based youths at Hawthorn Forest Farm in Guangdong Province have found out a simple and effective method of prevention and treatment. They use an ordinary chest stethoscope for auscultation of trees. They quickly and accurately determine the location of the trees according to the sound emitted by the worms when eating them. Deep cone stab, or hollow cone irrigation