Tropical Grasslands (1992) Volume 26, 30–39

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

L.E. POWERS, R.A. DUNN, R. McSORLEY1, D.D. BALTENSPERGER2 and D.S. WOFFORD3

1Nematology Laboratory, Gainesville, University of Florida;
2Department of Agronomy, University of Nebraska, Lincoln;
3Department of Agronomy, Gainesville; Florida, USA.

Abstract

Plants which are resistant to root-knot nematodes may exhibit this resistance before infection or after. infection. This is important when screening for resistance to nematodes. To determine the mode of resistance in Alysicarpus vaginalis, five 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.

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