There are multiple tactics for managing SCN:

• Rotate to non-host crops
• Rotate resistance sources
• Rotate varieties with the same resistance
• Consider a nematode-protectant seed treatment (test it for yourself)
• Manage weedy hosts
• Maintain plant health

Soil testing tips:

• Where in the field? To determine if SCN is present in a field, take samples from the top 8-inches of soil in the root zone, a sample from 10-acre sections with 10-20 subsamples and collect samples in a zig-zag pattern along the rows. To sample a problem area within a field, take samples from the top 8-inches of soil in the root zone and collect several subsamples from margins of symptomatic areas
• When? After the harvest of a soybean crop or in the spring before planting soybeans
• What? SCN egg count test
• How often? Every three years
• Where should soil test samples be sent?
  SCN Diagnostics
  1721 East Campus Loop
  University of Missouri
  Columbia, MO 65211-5315

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What to know about rotating different resistant varieties:

• Not all resistant varieties perform equally
• Growing the same resistant variety repeatedly can lead to an increase in SCN reproduction on that variety

What to know about rotating different sources of resistance:

• Ask your seed dealer the source of SCN resistance in the soybeans you are planting
• Repeated use of the same resistance source can lead to SCN population shifts
• To preserve their effectiveness, rotate the source of SCN resistance
• An SCN (HG) type test can help you determine how effective a source of resistance is against SCN in your field

What to know about rotating to non-host crops:

• SCN cannot reproduce in the absence of a suitable host
• Rotate to non-host crops such as alfalfa, barley, canola, corn, cotton, forage grasses, oats, rye, sorghum, tobacco, or wheat

Nematode-protectant seed treatments:

• Nematode-protectant seed treatments do not eliminate SCN from your field and can be variable in their reduction of SCN
• If considering a nematode-protectant seed treatment, test it in your own field
• Nematode-protectant seed treatments should always be used in conjunction with SCN resistant varieties

Other need-to-knows about SCN:

• Soil sampling is the best way to determine SCN population densities in your field
• Reduce plant stresses that can increase SCN damage such as nutrient deficiencies, insect damage, or other diseases
• Weed management is critical because many weeds can be SCN hosts
• Once present in a field, eradication of SCN is not possible