松扁叶蜂(Acantholyda pinivora Enslin)属膜翅目,扁叶蜂科。国外分布于中欧,北欧,意大利,英国,法国,苏联西伯利亚,蒙古北部,日本。在国内首次发现于山东天麻林场,1967年在山西壶关县树掌林区,为害平均树高8米,平均直径14厘米,40—50年生的油松(Pinus tabulaeformis)次生林。当时发生面积近200亩,现今已蔓延成灾达3万亩,并向油松人工幼林蔓延为害,是松树的严重害虫之一。松树受害后,重者像火烧过一样,若连续受害2—3年,则林木干枯死亡。为此,我们于1977—1978年对害虫的生物学特性,发生规律及其防治方法进行了调查研究。现将结果报道如下。一、林区概况 Acantholyda pinivora Enslin genus Hymenoptera, flat-leaf bee Division. Foreign distribution in Central Europe, Northern Europe, Italy, Britain, France, the Soviet Union Siberia, northern Mongolia, Japan. It was first discovered in Tianma Forest Farm in Shandong Province. In 1967, it was damaged in Pinus tabulaeformis secondary forest with an average height of 8 meters and an average diameter of 14 cm. At that time, an area of ​​nearly 200 acres occurred, and now has spread to 30000 acres of disaster, and the spread of Pinus tabulaeformis young trees, is one of the serious pine pests. After the pine tree is damaged, the heavy ones are like the fires, and if they suffer for 2-3 years continuously, the trees die dead. To this end, we conducted in 1977-1978 on the biological characteristics of pests, the occurrence of laws and prevention methods were investigated. The results are reported below. First, the overview of the forest