Meloidogyne incognita failed to reproduce on the weeds Lantana camara, Melampodium divaricatum, Bidens pilosa, Lepidium virginicum, and Tagetes filifolia under greenhouse conditions. Reproduction on Asclepias curassavica, Acmella oppositifolia, T. microglossa, and T. jalisciensis was poor. Root galling on a successive tomato crop was severe in pots previously planted with T. jalisciensis, moderately severe after T. microglossa and A. oppositifolia, light after T. filifolia and B. pilosa, and with no galling following A. curassavica, L. camara, M. divaricatum and L. virginicum.