They are lumped into one classification that is called unrelated, because they are unrelated to the main eight genetic families. Seedling vigor is a hybrid characteristic that takes on much greater importance in no-till. As seed ages into its second and third year, medium flats retain seedling vigor better than other grade sizes. Therefore, we recommend medium flat seed for no-till. Delayed emergence from cooler, wetter, no-till soils frequently results in a delay in maturity as well.
Crop residue carries most corn diseases and insects to the next crop.
Therefore, the increased residue found in no-till settings increases disease and insect pressures. Hybrids with strong leaf disease resistance and staygreen are needed to fight off leaf diseases.