All male and female stages are vermiform and adults are 0.9-1.8 mm long. This species attacks tubers and rhizomes, stem-like underground parts, causing the formation of necroses. Nematodes are present between healthy and necrotic tissue and all stages from egg to adult may be found. Since it has little resistance to dryness, this species occurs exclusively in wet land. D amage - At harvest, tubers exhibit small discoloured spots.
Underlying tissues are spongy and brownish, forming lumpy masses.
Decomposing tissues are colonized by saprophagous nematodes. Tubers in store dry out and harden.