天牛成虫体长1~50多厘米不等,长筒形,体壁坚硬,触角鞭状,与身体等长或更长,体色有黑、褐、黄等多种,常有各种鲜艳颜色和形状的斑纹。幼虫圆筒形,头小胸大,白色或淡黄色,足极小或无。天牛是行道树、防护林、庭院公园、厂矿学校绿化树木和树桩盆景的重要害虫,乔木受害更重,少数种危害草本花卉。幼虫蛀食主干和根,使树木生长不良,树势衰弱,枝枯折断,经数年连续危害后,严重的造成全林枯死。天牛排出粪便恶化环境。成虫咬食嫩枝皮层,造成枝梢枯萎,尤其是松墨天牛,除直接危害外, Adult beetles body length of 1 to 50 centimeters ranging, long cylinder, body wall hard, tentacles whip, and the body as long or longer, body color black, brown, yellow, etc., often with a variety of bright Color and shape of the markings. Larvae cylindrical, head small chest, white or light yellow, with little or no foot. Cerambycidae is an important pest of trees, shelterbelts, courtyard parks, greenery in schools and mines, and bonsai trees in stumps. Trees are harmed even harder, and a few species endanger herbaceous flowers. Larvae eaten the main trunk and roots, poor growth of trees, tree weakness, dry branches off, after successive years of continuous damage, the serious result of the whole forest dead. Beef excretion excretion deteriorated environment. Adult bite the skin of the shoot, resulting in shoots withered, especially Monochamus alternatus, in addition to direct harm,