云杉八齿小蠹的风险分析报告

云杉八齿小蠹可危害多种云杉。危害初期幼虫在寄主树干坑道内取食,树皮生长正常,针叶颜色正常；危害中期被害树干上可见小蠹羽化孔,树皮较易剥离,针叶开始变色；严重危害时被害树干树皮极易剥落,皮下可见小蠹和幼虫,或树木枯死,对云杉和木材生产造成一定程度的危害。通过对云杉八齿小蠹的风险分析,其风险评估值R=1.85,在我国属中度危险的林业有害生物。

Risk Analysis Report of Ips typographus in China

Ips typographusScouldSdamageSmany kinds ofSspruce. During theSearly damageSlarvae fed in tunnelSin theShostStree trunks. The bark grown normally and the color were normal too. There were many emergence holes on the tree trunk during the harm of interim, with the bark falling and the color of needle changing. Serious damage could lead to death which caused great economic loss to theSspruce and timber product. According to the risk analysis of Ips typographus,StheSvalue of risk evaluation forSR was 1.85, and belonging toSa moderate dangerous forest pest inChina.