桑天牛是危害桑树树干的一大害虫。近年来,各地桑园多有发生,特别是家庭小桑园的新嫁接桑发生更为严重。该虫在我省1—2年发生一代,以幼虫在树干内越冬,成虫6月下旬羽化,啃食桑皮,7月上旬产卵,下旬孵化。每只雌成虫产卵100粒以上,每天约产1—6粒。成虫寿命达80多天。卵经两周孵化,孵化后大部分幼虫蛀入木质部,向下蛀食成直孔道,每隔相当距离,向外蛀一排泄孔,排出新鲜粪便。被害桑树轻则枝短叶薄,重则整株枯死。枝皮整圈被害后,枝条折断或枯死。 Mulberry is a major pest that harms the trunk of the mulberry tree. In recent years, many mulberry fields have taken place in various places, especially the new mulberry mulberry family Mulberry occurred more serious. The worm occurred in our province 1-2 years to a generation of larvae wintering in the trunk, adult emergence in late June, eating mulberry, spawning in early July, late hatch. Each female adult spawns more than 100 eggs, about 1-6 produce a day. Adult life of more than 80 days. The eggs hatch for two weeks. After hatching most of the larvae invade the xylem and desalinate into straight tunnels. At a considerable distance, the larvae erupt and drain fresh excrement. Mulberry trees were light branches short leaves thin, heavy whole plant died. After the whole branch of the tree was killed, the branches were broken or dead.