Braasch, H.

Schönfeld, U.

English

JKI Open Journal Systems (Julius Kühn-Institut)

  IUFRO / REPHRAME International Conference on Pine Wilt Disease 2013  Berichte aus dem Julius Kühn-Institut 169. 2013 127 Braasch H, Schönfeld U, Improved key to the species of the xylophilus group of the genus Bursaphelenchus Fuchs, 1937. In: Schröder, T. (ed.), Pine Wilt Disease Conference 2013, pp. 127-128, Braunschweig, ISSN: 1866-590X (144) Improved key to the species of the xylophilus group of the genus Bursaphelenchus Fuchs, 1937 Helen Braasch1 and Ute Schönfeld2 1 Kantstrasse 5, D-14471 Potsdam, Germany, before: Federal Biological Research Centre for Agriculture and Forestry, Messeweg 11, D-38104 Braunschweig, Germany 2 State Office for Rural Development, Agriculture and Land Reallocation, Steinplatz 1,  D-15806 Zossen, Germany    A correct determination of the pine wood nematode becomes more difficult, the more related or similar species are described. In view of the fact that a further spread of the nematode should be considered and continuously new Bursaphelenchus species are detected, identification keys must be adjusted accordingly. Since the publication of a dichotome morphological key for species of the xylophilus group of the genus Bursaphelenchus (Braasch, 2008), several new species of this group have been described. These species are B. macromucronatus Gu, Zheng, Braasch & Burgermeister, 2008; B. populi Tomalak & Filipiak, 2010;  B. firmae Kanzaki, Maehara, Aikawa & Matsumoto, 2011; B. paraluxuriosae Gu, Wang, Braasch, Burgermeister & Schröder, 2012; B. koreanus Gu, Wang & Chen, 2013 and B. gillanii Schönfeld, Braasch, Riedel & Gu, 2013. Based on the key published by Braasch (2008) and the revised intrageneric grouping of Bursaphelenchus by Braasch et al. (2009), an improved dichotome key including in the meantime newly described species is presented. The decision-making is supported by pictorial representation of important features.  Two species found in aspen partially share characters with the xylophilus group and are not considered in the key: B. trypophloei Tomalak & Filipiak 2011 and B. masseyi Tomalak, Worrall & Filipiak, 2013, which can easily be separated from the xylophilus group species by spicule morphology, having shorter condylus and rostrum. Characters useful for identification of xylophilus group species are female tail shape (cylindrical, subcylindrical or conoid, round-tailed or digitate, with or without mucro), shape and size of spicules, several measurements and ratios (a, c’) and position of excretory pore with a certain variation of the last character.     IUFRO / REPHRAME International Conference on Pine Wilt Disease 2013  Berichte aus dem Julius Kühn-Institut 169. 2013 128 The recognition of the harmful quarantine pest B. xylophilus using morphological characteristics in laboratories of the National Plant Protection Services is facilitated by an adapted and simplified key, which separates species clearly distinguishable from B. xylophilus without species identification and includes only two very similar species. Molecular methods are additionally advisable to confirm a morphological diagnosis. 

Improved key to the species of the xylophilus group of the genus Bursaphelenchus Fuchs, 1937

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Improved key to the species of the xylophilus group of the genus Bursaphelenchus Fuchs, 1937

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