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粗鞘双条杉天牛(Semanotus bifasc-iatus sinoauster Gressitt)是为害杉木最严重的蛀干害虫,是杉木生产中急待解决的重要问题之一。陡盾茧蜂(Ontsira sp.)是粗鞘双条杉天牛幼虫的一种体外寄生蜂,该蜂于1973年在信宜县大雾岭林场杉林内首先发现,从1974年起广东省林科所和广东省播扬林场等单位协作,对其生物学特性及繁殖和利用技术进行了研究,并用来防治粗鞘双条杉天牛取得了显著的放蜂效果。1974年播扬林场杉林的为害率和虫口密度分别为77.0％和4.65条/株,4,000多亩杉林经过几年分区释放陡盾茧蜂进行防治后,到1983年
Semanotus bifasc-iatus sinoauster Gressitt is one of the most important stem borers for the damage of Chinese fir and is one of the most urgent problems to be solved in the production of Chinese fir. Ontsira sp. Is an ectoparasite parasitoid of the larva of Coccinella septempunctata. The bee was first found in the fir forest of the Great Wulingling Forest Farm in Xinyi County in 1973. Since 1974, The institute cooperated with Guangdong Provincial Forest Farm and other units to study its biological characteristics and breeding and utilization techniques, and used to prevent and cure the crude Cunninghamia lanceolata. In 1974, the damage rate and population density of Chinese fir plantation were 77.0% and 4.65 / plant respectively, and more than 4,000 Chinese fir plantations were released for control after several years of partitioning.