The only known host plant of this obligate parasite is the important crop alfalfa or lucerne, Medicago sativa.

The second instar larvae are mobile in damp soil and search down to a depth of 30 centimetres for suitable roots to invade.

The females remain attached to the root tissues by their heads, continue feeding and start laying eggs.

Control measures preventing yield losses include crop rotation and the use of tolerant varieties.

Other factors affecting the harm done include the date of sowing, the density of seeding, the use of cover crops and the weather.