Corn Nematode Sampling Guidelines from United Soils Datasheet

Plant parasitic nematodes are in every field to some extent, ranging from no obvious crop impact to severe injury and tremendous yield loss. Above-ground symptoms of nematode damage to corn include general stunting resulting in uneven plant height, general yellowing of leaf tissue, poor pollination, small ears, and lodging later in the growing season. The symptoms that occur below ground are quite variable depending on the nematode species and the environmental conditions present in the field and can include stunting of the root system, slight, general root discoloration, distinct, dark necrotic root lesions, and a proliferation of fibrous roots.