Lately there have been lots of questions asked about sampling fields for plant-parasitic nematodes that feed on corn. This diverse group of microscopic worms includes some species that cause yield loss at very low population densities (numbers), other species that are not harmful until population densities reach many hundreds or more per 100 cm3 (a little less than a half-cup) of soil, and still other species that are not thought to be harmful to corn at all.
Iowa State University
Tylka, Gregory L., "Sampling for Nematodes that Feed on Corn Not Advised in the Fall" (2017). Integrated Crop Management News. 2471.
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