Soybean Cyst Nematode: Part 2 - Management Options

Soybean cyst nematode (SCN) is the #1 hidden yield robber in soybeans. SCN has significant yield impacts before foliar symptoms are even observed in the field. SCN can multiply very quickly, so it is important to begin field-by-field management when they are detected, even if numbers seem low.

📸: Iowa State University/Featuring the SCN lifecycle infection in soybean roots.  

1. Sample for the Pest

SCN testing is best performed anytime soybeans are not actively growing in the field. To test for SCN, use a soil probe to take several samples 6–8" deep across the area you are sampling. Collect the soil cores from areas of similar soil types and mix the cores from each area in a bucket. Place two cups in a plastic zippered bag and store in a cool, dark place (like the fridge) until shipped for analysis.

2. Use Crop Rotation and Weed Management

If SCN is detected, rotate soybeans with non-host crops like corn, small grains, and alfalfa. Under average conditions, SCN may decline by 50% in the first year under a non-host crop. If SCN populations are high, rotate to a non-host crop for 2–3 years. SCN can also reproduce on weeds, like henbit and purple deadnettle, so controlling your weeds also helps manage SCN.

3. Utilize Variety Resistance and Seed Treatment

Rotate between SCN-resistant soybean products. Currently, there are two major sources of SCN resistance: Peking and PI-88788. SCN populations are adapting to the PI 88788 native resistance. The PI 88788 level of resistance is considerably less effective now in the 2020s compared to when it was introduced in soybean products in the early 1990s.

Alternating SCN-resistant soybean products should be used in combination and in rotation with other management practices, such as ILEVO^® seed treatment. It is critical to rotate these native SCN traits for their longevity. ILEVO seed treatment is the only effective product for SDS and nematodes, and it is active against all plant parasitic nematodes.

📸: BASF employee/Featuring an aerial view of a soybean field.

Read more about the differences between Peking and PI88788 in Part 3: Tools against a Silent Robber.

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