The karyotypes of stem nematodes of wild plants.
The karyotypes of Ditylenchus dipsaci from wild plants (Taraxacum officinale, Falcaria vulgaris, Hieracium pratense, H. pilosella, Cirsium setosum and Picris sp.) were compared to that of D. dipsaci from cultivated plants. Although the chromosomes were similar in size and morphology, their numbers were significantly higher than those of the stem nematode from cultivated plants (n=12), ranging from n=19 to n=28. The separation of parasites of these wild plants from the composite species is discussed.