They are a parasite in a large number of plants, mainly in temperate regions. These lesion nematodes feed and reproduce in the roots of these plants and they remain mobile, unlike other nematodes.
The major sign you might have a problem with these pests is the lesions they leave in the roots. These root lesions not only cause problems by leaching away vital nutrients, but they also become a pathway for other bacteria and fungi to enter. These foreign contaminants can cause infection in the plant.
The main body of the plant may become wilted and have stunted growth. Lesion nematodes can cause significant loss of crop yield.