Lesion Nematode
Pratylenchus penetrans, P. vulnus, P. neglectus
Overview
Migratory endoparasitic nematodes that feed within root tissue, creating necrotic lesions that serve as entry points for secondary fungal and bacterial pathogens.
Symptoms
Dark, necrotic lesions on roots. Reduced root branching and mass. Stunted growth. Yellowing foliage. Increased susceptibility to Verticillium wilt and other soil-borne diseases. Yield reduction.
Environmental Conditions
Variable
Prevention
Rotate with non-host crops. Plant resistant varieties. Add organic matter. Use cover crops that suppress nematodes (marigolds, sudangrass). Avoid planting in known infested sites.
Management
Crop rotation with non-hosts. Soil solarization. Organic amendments to promote beneficial soil organisms. Biofumigation with brassica crops. Marigold cover crops.