Plant-parasitic nematodes are microscopic worms that live in the soil and feed on plant roots. Nematodes that feed on corn occur in almost every field in Iowa, but most do not reduce corn yields measurably until they increase to high population densities (numbers). Fall is not a recommended time to check fields for damaging population densities of nematodes that feed on corn.
Iowa State University
Tylka, Gregory L., "Fall Time to Sample for SCN—But Not for Nematodes That Feed on Corn" (2011). Integrated Crop Management News. 277.
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