Evaluation of Leucaena Species Germplasm for Genetic Resistance to Meloidogyne incognita and M. javanica


  • A. R. Zimet
  • K. H. Quesenberry
  • R. A. Dunn


Alysicarpus vaginalis, Root-Knot Nematodes


There has been increasing interest in adapting tropical legumes to parts of the Southern United States and worldwide. Fast-growing trees, such as Leucaena (Benth.) offer promise as forage and biomass crops, and easily adapt to subtropical environments. Few disease and pest problems have been linked to Leucaena spp., but a low level of root-knot nematode galling was observed in a forage evaluation planting in Florida. Our objectives for this study were to evaluate diverse Leucaena spp. for genetic resistance to two root-knot nematode species prevalent in Florida soils. Ninety-seven accessions of Leucaena spp. were screened in a shadehouse for reaction to Florida populations of race 3 of Meloidogyne incognita (Kofoid and White) Chitwood and M. javanica (Treub) Chitwood. The results from the nematode study, using three levels of nematode inoculum (0, 3, and 9 eggs/cm of soil) on 11-week-old plants grown in 150-cm plastic containers, showed a general absence of root galling of the plant