Response of Sesamum indicum and S. radiatum Accessions to Root-knot Nematode, Meloidogyne incognita

  • J. T. Walker
  • J. B. Melin
  • J. Davis


Twenty Sesame indicum and four S. radiatum accessions in the USDA Plant Introduction collection were evaluated for reaction to the root-knot nematode, Meloidogyne incognita race 3, at two initial egg densities under greenhouse conditions. All sesame accessions produced considerably fewer root galls than the tomato cultivar Rutgers. Gall numbers varied slightly among accessions at the higher infestation density with even less variation at the lower density. Egg mass indices indicated little reproduction. Seventy percent of the accessions weighed less at the higher egg density than at the lower egg density. All the sesame accessions tested are resistant to M. incognita and have the potential for use as rotational crops for suppressing this nematode. Key words: germplasm, host reaction, Meloidogyne incognita, nematode, plant breeding, resistance, sesarne, southern root-knot nematode.