双条杉天牛是我国重要蛀干害虫,1996年1月被我国列为森林植物检疫对象,严重威胁着一些地区的古柏和侧柏纯林。截止2001年底,该虫在山东已造成近30万株侧柏死亡。双条杉天牛寄主主要有圆柏属、扁柏属、侧柏属等柏类树种和杉木等重要园林绿化和石灰岩质山地造林树种。双条杉天牛主要以幼虫在侧柏树皮下串食危害,由于其虫粪堆积在虫道内,不排在树干外,幼虫隐蔽,难以发现;成虫羽化不集中,防治难度大,柏树被害后,轻者树势衰弱,针叶枯黄,重者把木质部蛀食一圈,导致侧柏死亡。此虫喜欢在被压木、风折枝等处活动,交尾产卵。幼虫蛀入林木的韧皮部及木质部为害,切断或破坏疏导组织而影响水分养分运输,轻者影响生长势,重者整株枯死。 Cunninghamia lanceolata is an important borer pest in China. In January 1996, it was listed as a quarantine object of forest plants by our country and seriously threatened the pure plantations of arborvitae and arborvitae in some areas. As of the end of 2001, the insects in Shandong have caused the death of nearly 300,000 Platycladus orientalis. The main owners of Cunninghamia lanceolata are Sabina, Hinoki, Platycladus and other species of cypress and fir and other important landscaping and limestone mountain afforestation species. Larvae mainly larvae in the arborvitae bark under the serial hazards, because of its insects accumulation in insects, is not in the trunk, the larvae hidden, difficult to find; adult insects are not concentrated, difficult to control, after the cedar was killed, The light tree weakness, yellowish needles, heavy wood in the xylem eruption, resulting in Arborvitae death. This worm like being pressed wood, wind folding branches and other activities, copulation spawning. Larvae eroded trees phloem and xylem damage, cut off or damage to divert the organization and affect the moisture and nutrient transport, the light affect the growth potential, severe cases whole plant dead.