Plant Parasitic



Webmaster: Daniel Snyder

Last Edited: May 30, 2002


Genus Rotylenchulus

The Reniform Nematode

The only species of economic importance in agriculture is R.reniformis

  • wide host range (140 species in 30 families)
  • subtropics (soybean, cotton, potato, cowpea)
  • tropics (banana, tea, coffee, citrus, ginger)
  • Southeast US (increasing problem on cotton in NC)
  • young female infective stage, adult female is kidney shaped
  • high populations may not cause damage
  • reproduction by amphimixis
  • development from J2 to preadult without feeding
  • can survive in air dried soil for up to 2 years
  • males are not parasitic
  • 40-200 eggs laid in a gelatinous matrix after 7-10 days post infection
  • young female migrates intracellularly to the stele causing necrosis in cortex
  • a prosyncyte is formed by cell wall dissolution and cytoplasmic coalescence
  • feeding tubes are formed, but nematode but no cell wall ingrowths are observed
  • 100-200 cells may be incorporated into syncytium along root axis
  • general symptoms resemble nutrient deficiency