Plant Parasitic



Webmaster: Daniel Snyder

Last Edited: May 30, 2002


Genus Ditylenchus

Ditylenchus (The Stem and Bulb Nematode) migratory endoparasite mainly in shoots diverse feeding habits (can feed on fungi)

Important species:

  • D. dipsaci: can infect over 500 plant species
  • D. destructor: potato dry rot (mig. endoparasite of underground plant parts)
  • D. myceliophagus: fungivore, pest for mushroom industry (France)

Life Cycle and Host-Parasite Interactions

  • reproduction by amphimixis (needs males)
  • females lay 200-500 eggs which usually hatch in the plant tissue
  • all stages are infective, penetration at shoot apical meristem
  • migratory feeding leads to cavities in the parenchymous tissue
  • pectinase production is speculated in degradation of the middle lamella that results in cell separation and cavity formation during infection
  • swelling, galling, stunting, distortion, and necrosis result from serious infection
  • small numbers of nematodes are capable of causing serious damage
  • no necrosis and little damage is seen in resistant varies with incompatible reactions
  • 4th stage juvenile survival stage (up to 23 years)
  • produce "Nema Wool" an anhydrobiotic survival structure
  • cause galling and distortion to leaves, brown rings in bulbs
  • life cycle is 19-23 days at 15 degrees C

The HYPPZ site for Ditylenchus