Note the galled roots due to Cereal Root-knot nematode.
Photo part of OSU Extension Plant Pathology Slide collection.
See:
Wheat (Triticum aestivum) - Nematode, Cereal Cyst
Wheat (Triticum aestivum) - Nematode, Root-knot
Wheat (Triticum aestivum) - Nematode, Root-lesion
