Abstract
Nematodes belonging to two distinct genera are known as the causal organisms of galls on the roots of plants. One of these belongs to the genus Anguillulina=Tylenchus and the other to the genus Heterodera. The former, under the name of Tylenchus hordei Schøyen, 1885, has been known for many years as the producer of galls on the roots of certain grasses and cereals; the latter, under the name of Heterodera radicicola (Greeff, 1872) Müller, 1884, as the producer of galls on the roots of a very large number of wild and cultivated plants both monocotyledons and dicotyledons.

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