桑天牛是丘陵山地桑园的主要害虫之一,食性很杂,除严重危害桑树外,还可危害油桐、白杨、柳树等林木。桑天牛两年发生一代,以幼虫越冬。成虫于6-7月间产卵于1年生枝条上,产卵时先将枝条咬成“U”形伤口,将树皮全部啃碎翻起,然后产一粒卵于其中,卵呈乳白色。幼虫孵化后蛀食枝干,并在枝条上和树干中向下蛀食,形成一条弯曲的隧道,在蛀道中每隔相当距离向外蛀一排泄孔,以排粪便,幼虫老熟后,在下端 Morus alba is one of the main pests of the mulberry fields in the hilly and mountainous areas. The food habits are very complicated. In addition to the serious damage to the mulberry trees, the mulberry trees can also endanger trees such as tung oil, poplar and willow trees. Morus A generation occurs two years to wintering larvae. Adults in June-July oviposit on the annual branches, spawning first branches bite into “U” -shaped wounds, the bark all nibble up, and then produce an egg in them, the egg was milky white. After the larvae hatch, they will eat and dry their branches, and they will erode on the branches and trunk to form a curved tunnel where they will be emasculated for a long time at every considerable distance to defecate, Lower end