However, SCN stress makes plants more susceptible to other pathogens or causes of reduced seed weight and quality. SCN-resistant varieties have yield loss in high populations of SCN eggs in the soil. Resistant varieties have consistently out yielded susceptible varieties when populations were below 5,000 eggs per 100 cubic centimeters of soil. Soybean yields in either resistant or susceptible varieties were not reduced when the egg population was below 400 per 100 cubic centimeters of soil. SCN populations vary year to year and field to field.
Monitoring is imperative.
Crop rotation into a non-host crop like corn is one alternative. Another is to plant different SCN resistant varieties since SCN can adapt to some resistant varieties. Prior to now the primary topic for most farmers has been their concern with deciding whether to plant GMO or non-GMO seed. Now another concern is drowning their GMO discussions. That concern is the persistent dryness.