Effects of resistance in alyce clover (Alysicarpus spp.) on root-knot nematode (Meloidogyne spp.) populations

To determine the mode of resistance in Alysicarpus vaginalis, 5 lines were inoculated with root-knot nematodes (Meloidogyne spp.) and the dynamics of the population were studied. Pre-infectional resistance mechanisms were effective against M. incognita, but not against M. arenaria. Post-infectional mechanisms were effective against both nematodes. Although pre-infectional mechanisms alone decreased root nematode populations, post-infectional mechanisms appear to be more important in the overall resistance. All lines exhibiting post-infectional resistance mechanisms had fewer adult females in the root systems after the time to complete one life cycle.