Morphometric Comparisons of Geographic and Host Isolates of the Red Ring Nematode, Rhadinaphelenchus cocophilus

  • Karin Gerber
  • Robin M. Giblin-Davis
  • Reginald Griffith
  • Jenny Escobar-Goyes
  • Alfredo D'Ascoli Cartaya
Keywords: African Oil Palm, Coconut Palm, Cocos nucifera, Elaeis guineensis, Ecuador, Little Leaf, Morphometrics, Palm Weevil, Red Ring Disease, Red Ring Nematode, Rhadinaphelenchus cocophilus, Rhynchophorus palmarum, Trinidad, Venezuela


Morphometrics of adult females and males of the red ring nematode, Rhadinaphelenchus cocophilus, were compared from red ring diseased (RRD) stem tissue from the coconut palm, Cocos nucifera L., from several plantations in Trinidad; from a RRD coconut palm in Esmeraldas, Ecuador, and from oil palms, Elaeis guineensis, with RRD and little leaf symptomatology in San Felipe, Venezuela. Also, juvenile R. cocophilus (J2, JIII) from coconut palm tissue and JIII's from the palm weevil vector of RRD, Rhynchophorus palmarum, were measured. Morphometric differences observed between the different populations of adult R. cocophilus in this study probably represent infraspecific variability.