Hoplolaimus species
The Lance Nematode

  • Damage to Corn.   Hoplolaimus  is very damaging  to corn seedlings early in the growing season.  Soil containing as few as 100 nematodes will cause symptoms in young plants.
  • Biology.  At least four species of lance nematodes affect corn. Hoplolaimus are rather stout, large nematodes,  with stylet knobs projecting forward.
  • Ecology.   Lance nematodes are widely distributed in the United States, but large populations are found only in sandy or well-drained soils.
  • Symptoms.    Stunting can occur early in the growing season.  Although affected plants can reach the same height as noninfected ones by the end of the season,  they remain more spindly with greatly reduced yields.
  • Damage to other crops.   The lance nematode has a wide host range, and has been shown to parasitize many types of  plants.
  • Control.   Crop rotation may be effective, if resistant crops are used.  Chemical control using fumigants has also been effective.
One or more of these nematode species currently is or could potentially be an APHIS quarantine pest.