[1] These are among the largest plant-parasitic nematodes, reaching 1.5 to 3 millimetres (0.059 to 0.118 in) in length.

Its sex organs include a pair of flanged spicules and a protruding gubernaculum to guide them during mating.

[2] Awl nematodes generally occur in moist and wet soils.

Damage is apparent when the root tips turn brownish yellow and develop lesions.

D. heterocephalus has been noted on a variety of crop plants, including sugarcane, beans, tomato, blueberry, and corn.