There continues to be lots of questions about whether plant-parasitic nematodes are causing damage to Iowa’s corn crop. This varied group of microscopic worms has some species that cause damage to corn at very low population densities (numbers) and other species that are not harmful until population densities reach many hundred or more per 100 cm3 (a little less than a half cup) of soil.
Iowa State University
Tylka, Gregory L., "Stunted, Yellowing or Wilting Corn: Could Nematodes Be the Cause?" (2012). Integrated Crop Management News. 199.
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