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通过庐山周边几个县松枯萎病发生现状调查,分析庐山自然保护区有易感病寄主,传播媒介,物流、人流的频繁活动等因素存在,山上松林极可能发病。提出严格检疫,建立监测网和检测点,积极消灭等措施和预防对策。 相似文献
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采用多指标综合评价方法对贵州省拟松材线虫病的危险性进行了分析。通过风险性分析和计算,得出拟松材线虫是松树的重要病害种类,其R值为1.74,属于中度危险的林业有害生物。在此基础上,探讨了贵州省拟松材线虫病的风险管理方法。 相似文献
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根据桐庐县特定的区域特点,分析了桐庐县松材线虫病预防工作的严峻形势,总结了桐庐县多年来松材线虫病预防工作的实践和取得的成效,并从保护森林生态环境和杭州市旅游西进的战略高度,提出了加强网络建设,强化动态监测;加强内查外拒,严防病源人为传播;加快松林改造,构建自然屏障等预防对策。 相似文献
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Genetic diversity of pine‐parasitic nematodes Bursaphelenchus xylophilus and Bursaphelenchus mucronatus in China
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The internal transcribed spacer (ITS) regions of rDNA have been routinely employed for identification and phylogenetic analysis of many nematode species. In this study, the intra‐ and interspecies ITS genetic diversity of Bursaphelenchus xylophilus and Bursaphelenchus mucronatus was evaluated. Ninety‐one isolates of the two nematode species collected from 14 Chinese provinces, Japan and Korea were used for ITS‐PCR and sequencing. An unweighted pair group cluster analysis dendrogram clustered them as two B. mucronatus and one B. xylophilus independent clades. Principal component analysis showed the phylogenetic relationship of the two nematode species more clearly; B. mucronatus isolates were separated into more than four groups, whereas B. xylophilus isolates still clustered into a group. The results of the Mantel test indicated the correlation of genetic distance matrices and geographic distance matrices was significant for both nematode species. The genetic differentiation coefficient (Gst) and gene flow (Nm) of B. mucronatus were 0.341 and 1.091, respectively, suggesting the importance of landscape heterogeneity and considerable obstacles for genetic exchange among B. mucronatus isolates in China. However, Gst and Nm of B. xylophilus were 0.188 and 2.151, respectively, very different compared to B. mucronatus. This could be owing to the short‐term introduction of B. xylophilus into China and a rapid spread through anthropogenic pathways. Our work adds to the understanding of the genetic diversity and genetic relationship of the two pine‐parasitic nematode species, and will aid in controlling them in the future. 相似文献
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研究和综述了寄生松科植物的伞滑刃属(Bursaphelenchus)的线虫23种,松材线虫的寄主松科植物108种、携带昆虫40种及发病的环境条件。 相似文献
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总结了贝尔曼漏斗法分离镜检松材线虫实践经验,通过调高分离起始水温、室内气温和减少镜检液量、改变热杀死方式等措施,将常规分离镜检线虫时间从12h以上缩短到约6h. 相似文献
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