Belonolaimus species. The Sting Nematode Damage to Corn.  Belonolaimus is extremely damaging to corn. Numbers as low as 1- 10 per 100 CC of soil can cause damage to corn seedling. Biology. There are at least two Belonolaimus species  that feed on corn roots in North America. All are large nematodes (between 1.0 – 3.0 mm) possessing a characteristic long, slender stylet.  Ecology. Sting nematodes are restricted to very sandy soils.  In the north central states they become active as soon as soils become warm. As the season progresses, they appear to migrate deeper into the soil profile.  Symptoms. Sting nematodes severely trim the lateral roots of corn seedlings.  Stunted plants occur in patches throughout a field.  Damage to other crops. Sting nematodes have a wide host range including soybeans, wheat, peanuts, beans, and other crop plants.  Control. Rotation with alfalfa has been successful. Chemical nematicides have been successful in reducing sting numbers.  References.  The Sting Nematode (KSU)