Improved morphological key to the species of the xylophilus group of the genus Bursaphelenchus Fuchs, 1937.
Correct identification of the pine wood nematode Bursaphelenchus xylophilus becomes more difficult, as more related or similar species are described. Spread of the nematode is being monitored worldwide, and in view of the fact that several new Bursaphelenchus species have been described, identification keys should be adjusted accordingly. Based on the identification key of the xylophilus group published by Braasch (2008) and the revised intrageneric grouping of Bursaphelenchus by Braasch et al. (2009), an improved dichotome morphological key including newly described species (B. paraluxuriosae, B. populi, B. macromucronatus, B. firmae, B. koreanus and B. gillanii) is presented. The recognition of the quarantine pest B. xylophilus using morphological characteristics in laboratories of the National Plant Protection Services is facilitated by a simplified key.