萧氏松茎象在柳州市的发生及防治技术的调查研究

萧氏松茎象(Hylobitelus xiaoi Zhang.)是中国南方新暴发成灾的林业害虫，为了摸清该虫在广西壮族自治区柳州市的发生规律，掌握其有效防治方法，为开展萧氏松茎象综合治理提供科学决策依据。笔者通过定期解剖虫害木观察、林间设样地调查对比分析的研究方法了解萧氏松茎象的生物学及生态学特性。结果表明：萧氏松茎象在柳州市2年发生1代，其发生与寄主、林分类型、坡向、坡位、立地条件和林内地被覆盖率有一定相关关系。采用人工挖掘捕杀幼虫，翌年同期虫口密度可减少85.29%；虫道注射噻虫啉、氧化乐果药剂，防治效果分别达93.6%和94.6%；采取清除寄主周围的杂灌和枯枝落叶的生态控制措施，翌年受害株率可减少3.33%。按寄主受害特点，湿地松受害林分采取人工挖掘幼虫并辅以清杂，马尾松受害林分采取药剂注射及结合清杂，是控制萧氏松茎象危害的有效方法。

The Occurrence and Preventing Control Technology of Hylobitelus xiaoi Larvae. in Liuzhou

Hylobitelus xiaoi Zhang.was a kind of new forest vermin pest breaking out seriously in the southern parts of China.In order to clearly know its regular life in the city of Liuzhou,Guangxi Zhuang Nationality Autonomous Region,master the effective preventing methods,and offer scientific measures to comprehensively curb the Hylobitelus xiaoi Zhang.,the author learned the biologist and ecologist characteristics of Hylobitelus xiaoi Zhang.through regularly observing and analyzed the forest vermin pests and comparably analyzed the survey of the samples got from the forest.The results showed that one generation of Hylobitelus xiaoi Zhang.happened every two years in Liuzhou.The results showed that their appearance was somewhat related to the host,forest types,the direction of slope,the location of slope,site conditions and the coverage of inland forest.By using the manmade excavation to kill the younger larvae,the density of larvae population would be reduced by 85.29% compared with the same period in the following year.The preventing and controlling effects of moth road injection Thiacloprid and Omethoate pharmacy were respectively up to 93.6% and 94.6%.The harm rate of the plant in the following year would reduce 3.33% by cleaning the miscellaneous irrigation around the host and using the ecological measures to control the fallen leaves and deadwood.According to the characteristics of the host,the victims of wetland pine would be cleaned in the way of manmade excavation to kill the younger larvae and the victims of masson pine would be injected the pharmacy in combination of the cleaning measures.Both of them were effective ways to control the harm of Hylobitelus xiaoi Zhang.