Abstract
A new root-knot nematode, Meloidogyne microtyla, infecting grass roots is described and illustrated. M. microtyla differs from its closest relative M. incognita in spicular and stylet length of the male, structures of the female lip region and head, and in the production of very small galls on tomato roots versus large galls by M. incognita. The perineal pattern is remarkably similar to M. incognita; the identification of species of Meloidogyne is discussed with regard to this similarity. Its host range and distribution in Ontario are included. This new root-knot nematode is the second species found occurring in the field. The northern root-knot nematode M. hapla is commonly found in the field.
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