在林业生产中防治树干害虫是一项复杂而繁重的工作,这些害虫的幼虫在树皮下或木质部里发育,杀虫剂不能杀害它们,因此,生物防治具有很大意义。要进行生物防治,必须事先进行大量准备工作,例如查明食虫昆虫种的组成和生态学,许多国家正在进行这方面的工作,利用隐翅目昆虫和寄生昆虫防治树干害虫的初步试验已获得成功。 Prevention and control of trunk pests in forestry production is a complex and burdensome task. Larvae of these pests develop under the bark or in the xylem. Insecticides can not kill them. Therefore, biological control is of great significance. For biological control, a great deal of preparatory work must be done in advance, for example, to find out the composition and ecology of insectivorous insect species. Many countries are carrying out their work in this field. Preliminary experiments on the control of tree pests by using the hermit and parasitic insects have been obtained success.