Okra roots damaged by root-knot nematodes. Note gall or root-knots (left) and healthy roots (right).

Root-knot nematodes on French beans

Root-knot nematodes (Meloidogyne incognita / M. javanica) Roots of severely attacked (left) and healthy plant (right). Affected plants are normally stunted and eventually wilt and die. The most characteristic symptom is formation of root galls (knots) and these can be seen with the naked eye. Affected roots rot.

Root-knot nematode (Meloidogyne incognita) damage to potato.