近年来,围场县本着“为首都阻沙源,为京津蓄水源,为国家增资源,为群众拓财源”的方略,大力开展工程造林,其中杨树面积已达3万公顷。但随着造林面积的大幅度增加,各种林业有害生物也呈现出发生面积加大、危害程度加重之势,在2004年全国林业有害生物普查时,发现其中较为严重对杨树生长构成威胁的害虫有分月扇舟蛾、舞毒蛾、青杨天牛等。 In recent years, in accordance with the principle of “blocking the source of sand in the capital, reserving water resources for the Beijing-Tianjin region, increasing resources for the country and expanding resources for the masses”, the county has vigorously carried out afforestation projects, in which poplar area has reached 30,000 hectares . However, with the substantial increase of afforestation area, all kinds of forestry pests also showed the occurrence of an increase in the area, increasing the risk of the situation, in 2004 the national forestry pests census, found that more serious which poses a threat to poplar growth Insects have sub-monthly marine moths, Gypsy moths, green cows and other cattle.