双条杉天牛Semanotus bifasciatus(Motschulsky)是杉树最严重的蛀干害虫,目前仍未有很好的防治方法。1973年在信宜县大雾岭林场发现矛茧蜂(膜翅目姬蜂总科、茧蜂科、矛茧蜂亚科)(图1)。1974年以来在该场及化州县播扬林场对该蜂进行了研究。现已基本弄清其主要习性;找到了松天牛幼虫作寄主并初步掌握了繁蜂技术;在林 Semanotus bifasciatus (Motschulsky) is the most serious stem borer of cedar and there is still no good control method. In 1973, the Dalangling Forest Farm in Xinyi County found Psittacosus (Hymenoptera, Hymenoptera, Braconidae, Phlegmyceae subfamily) (Figure 1). The bee was studied in this field and in Huazhou County since 1974. Has basically been to find out its main habits; to find the pine caterpillar larvae host and initially mastered the bee technology; in the forest