Description of Ditylenchus dipsaci (Kühn, 1857) Filipjev, 1936 (Nematoda: Anguinidae) infesting garlic in Ontario, Canada.
Yu, Q., Ye, W., Badiss, A., and Sun, F. (2010). "Description of Ditylenchus dipsaci (Kühn, 1857) Filipjev, 1936 (Nematoda: Anguinidae) infesting garlic in Ontario, Canada.", International Journal of Nematology, 20(2), pp. 185-192.
Ditylenchus dipsaci, the stem nematode or the stem and bulb nematode, is a quarantine nematode pest for many countries. In recent years, it has become a serious pest on garlic in Ontario, Canada. Morphological studies revealed that this Canadian population has some interesting morphological variations from the classical description of the nomenclature types: the cuticle has longitudinal ridges; the lateral fields are flanked by areas in which some striae do not reach the lateral field; hemizonid is 1-3 annules anterior to the excretory pore; the anterior end of the bursa is 20 μm from the proximal end of the spicules; and some old males and females have needle-like crystals in the vas deferens and spermatheca, respectively. Other morphological characters match with the description of the type. The ITS sequence had a 100% match to sequences of many isolates from Europe and Asia. Phylogenetic study of the ITS sequence places this population in a well-supported monophylic clade with other populations associated with various crops in Europe and elsewhere.