一、三十年的回顾黑龙江省是森林比较集中的省份之一,有大面积的人工林.但由于人们的林业生产活动,例如采伐方式和强度、伐区清理方式和标准、造林方式和密度、造林地和树种的选择等等,往往缺乏考虑森林病虫害发生的规律,有些地方造林时没有考虑到该树种生长所需要的生态条件,盲目引入抗虫性较差的外地树种并大面积推广,或者经营管理粗放,不及时抚育以及自然灾害等原因而导致 A review of one to three decades Heilongjiang Province is one of the more concentrated forest provinces with a large area of ​​plantations, but due to its forestry production activities such as harvesting methods and intensity, cutting methods and standards for cutting areas, afforestation methods and density , Afforestation and tree species selection, etc. often lack consideration of the law of the occurrence of forest pests and diseases. In some areas, the ecological conditions required for the growth of the tree species are not taken into account when planting forests. Wild species with poor insect resistance are blindly introduced and popularized in large areas. Or extensive management, not timely education and natural disasters and other reasons