松针叶圆蝇是主要的森林害虫之一.成虫每年发生一代。在日本东北地区.幼虫在土内越冬,6～7月羽化出成虫.在日本赤松、日本黑松当年生针叶的2枚针叶间产卵.初孵幼虫马上侵入针叶内.晚秋至初冬一直寄生在针叶基部。受到寄生的针叶叶短.幼虫脱落后枯死,致被害木树势减弱,严重者枯死。除北海道外,该虫的分布遍及日本国土,特别是东北育种场管辖区域.秋田、山形、新泻县内的海岸林.10多年来经常发生危害.使海岸防沙林的功能大大降低。抗性品种的选育.是解决该虫危害的有效途径。以松针叶圆蝇被害林分中没有受害 Pine needles are one of the major forest pests, and adult adults occur one generation per year. In northeastern Japan, larvae overwinter in the soil and become adults from June to July .In the Japanese red pine, Japanese coniferous red needles spawn in two coniferous foliage, and the newly hatched larvae invade the needles immediately. Early winter has been parasitic in the coniferous base. Parasitic conifers are short, and the larvae die off after they fall off, resulting in a weakened tree shrubs and severe cases of death. Except for Hokkaido, the worm is distributed throughout Japan, especially in the northeast breeding grounds. Coastal forests in Akita, Yamagata and Niigata Prefecture have been harmed for more than 10 years, greatly reducing the functions of coastal erosion control forests. Breeding of resistant varieties is an effective way to solve the harm of the insects. To pine needles flies harm no damage in the forest