桑虎天牛是我省桑树的主要蛀干害虫。幼虫蛀食枝干的靭皮部形成层和木质部。被害树轻则枝细叶小、重则枯萎死亡。成虫外形似胡蜂,体长14～28毫米(如图)。幼虫淡黄色、圆筒形。老熟时体长约30毫米。此虫在我省3年发生两代,以幼虫越冬。各龄幼虫终年可见,成虫于6月上旬开始出现,6月下旬至7月上旬为成虫羽化出孔盛期。此时即交配产卵。卵多产在树枝干的树皮裂缝处及剪、锯口和伤口处、初孵化的幼虫先在 Sang tiger beetle mulberry main moth-eaten pests in our province. Larvae eaten branches of the phloem formation and xylem. Victims of trees light branches small leaves, heavy wither death. Adult shape like wasps, body length 14 ~ 28 mm (pictured). Larvae yellowish, cylindrical. When mature, the body length of about 30 mm. This pest occurs in our province for three generations three generations to larva overwinter. The larvae of all ages can be seen throughout the year, the adult began to appear in early June, and the end of June to early July is the emergence period of adult feathers. At this point mating spawn. Egg prolific In the trunk of the bark cracks and scissors, kerfs and wounds, the first hatch larvae in the