Abstract: Based on method of numerical taxonomy， the clustering analysis of 14 species of xylophilus group was performed. The results showed that Bursaphelenchus mucronatus， B.macromucronatus, B.fraudulentus, B.conicaudatus, B.doui and B.gillanii showed high consistency; B.singaporensis, B.koreanus and B.populi showed high similarity; B.paraluxuriosae, B.formae, B.baujardi and B.luxuriosae were closed to each other on the dendrogram; While B.xylophilus were independent relatively on the dendrogram after hierarchical cluster analysis.

Key words: xylophilus group, numerical taxonomy, nematode, morphology