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Symptoms and Signs

Key points to know

  • Stunting and yellowing are above-ground symptoms of SCN.
  • Early senescence of fields is an indirect above-ground symptom of SCN.
  • There can be serious yield loss due to SCN without any obvious above-ground symptoms.
  • Root stunting, discoloration, and fewer nodules are below-ground symptoms of SCN.
  • You can see SCN females with the naked eye.

1. Stunting and yellowing can be above-ground symptoms of SCN

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SCN Females Apparent on Infected Soybean Roots - 6/11/2014

The soybean cyst nematode (SCN) remains a leading yield robber of soybeans in Iowa and much of the Midwest. The presence of SCN in the field may not be apparent by appearance of visual symptoms (aboveground stunting and/or yellowing) for years after the nematode is introduced in a field. An easy way to check fields for the presence of SCN during the growing season is to look for telltale swollen, white SCN females on soybean roots. The SCN females are small, about the size of a period at the end of a sentence on a printed page.