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河北省承德市避署山庄系国家重点文物保护单位,近几年由于维修需要,由东北林区输入了大量落叶松、红松等原木,总计约2,000多立方米。经调查发现原木上携带有大量的小蠹虫类、天牛类等蛀干性害虫,对避暑山庄内的古松、古柏树及其他珍贵的园林树木威胁很大。据避暑山庄园林队调查,1976年共有200多年生的古松1,148棵,到1982年只剩下1,055棵,平均每年枯死15棵。古松死亡原因虽有多种,但树势衰弱易招致小蠹、天牛类次期害虫
In order to meet the maintenance needs in recent years, a large number of logs, such as larch and korean pine, have been imported from northeastern forestry regions in a total amount of about 2,000 cubic meters. The survey found that log carrying a large number of bark beetles, cerambycids and other bore insects, summer resort in the ancient pine, ancient cypress trees and other precious trees threatened. According to the survey of the Summer Palace Gardens team, there were 1,148 ancient Gusongs, born in 1976, leaving only 1,055 in 1982 with an average of 15 dead trees each year. Although a variety of reasons for the death of Gusong, but the weak decline of the tree easily lead to beetles, day beetles pests