Updated April 29, 2020:
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This research showed that there is a benefit to using cover crops in soils with a high SCN population and a low SCN population. This research also shows that a seed treatment such as ILeVO does not protect susceptible soybean varieties from SCN damage regardless if those soybean varieties are SCN resistant.
Better water infiltration and less water loss is accomplished by using a cover crop and results in less water runoff and nutrient loss.