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Ellsworth, Iowa > Soil Analysis > Soybean Cyst Nematode

Yield loss can take place even before soybean crop appears damaged

It is possible to have a yield loss of 30 percent or more without the soybean crop looking noticeably damaged during the growing season. Damage from SCN comes in the form of yield loss from root feeding, but SCN can also aid in the development of other root and stem diseases, contributing to even greater yield loss. Therefore, it is important to sample for SCN periodically to confirm its presence in each field and help determine management strategies once SCN has been identified.

Once infested, SCN is impossible to eliminate

Once SCN is established in a field it cannot be eradicated. Therefore, managing SCN is extremely important. This can be difficult since no single management tactic will control SCN, but utilizing several management strategies can help minimize yield loss.

Sampling Procedures Click Here  

Samples can be taken anytime during the year, however it makes the most sense to sample fields for SCN the fall just prior to harvest.

  • To effectively check fields for presence of SCN, soil must be collected from no more than a 20 acre section collecting a composite sample of 10-20 soil cores.
  • Higher risk areas (where SCN may first appear) include:

- Areas near a field driveway
- Along fence lines
- In low areas that may have flooded
- Areas of the field where soil pH is above 7.0

  • Mix the soil cores very well and place in a soil bag.
  • Keep the samples at room temperature or cooler and out of sunlight until they can be shipped to an AgSource Laboratories location. 

Sample Report

The results will be shown as eggs or cysts per 100cc of soil. AgSource Laboratories offers both cyst and egg counts.

To see an example of an AgSource SCN soil report, Click Here 

Management recommendations usually vary based on the SCN population density in the soil.  For more detailed information about soybean management and SCN management please go to Iowa State University Soybean Cyst Nematode webpage

Other Resources

  • AgSource Tech Bulletin
  • Soybean Cyst Nematode Management Guide 5th edition PDF
  • Purdue University webpage
  • The American Phytopathological Society webpage
  • Iowa State University Extension "Interpreting Soybean Cyst Nemstode Samples"
  • Iowa State University Extension "Soybean Cyst Nematode" PM879

    Contact AgSource Laboratories for more information about Soybean Cyst Nematode. (515) 836-4444  ellsworth@agsource.com