Mississippi State University University Partner

SCN is important in Mississippi:

  • Soybean is the 3rd most significant agricultural commodity in Mississippi.
  • Based on the previous surveys, SCN present in 76 of Mississippi’s 82 counties.
  • One million soybean producing acres could be infested with SCN.
  • The greatest concentration of SCN is in northeastern Mississippi. 

SCN Management Recommendations

There are multiple tactics for managing SCN:

  • Crop rotation including the use of high yield-producing varieties with resistance to Race 3 and Race 14
  • Avoid use of common and hairy vetches as cover crops
  • Control weed hosts of SCN
  • Deep chiseling and subsoiling
  • Maintain good soil fertility

Soil testing tips: 

  • Where in the field? Beneath previous crop row or root area (6-8 inches deep)
  • When? October – April
  • How often? Annually
  • Where should soil test samples be sent? 
    • Download a submission form and send to Mississippi State Plant Diagnostic Lab
      190 Bost North, Rm. 09
      Box 9612
      Mississippi State, MS 39762

Submission Form

What to know about rotating different resistant varieties:

  • Use Race 3 and Race 14 resistant varieties
  • Avoid planting Race 3 or Race 14 varieties more often than 1 year out of 3
  • Do not plant Race 3 resistant varieties in fields with high populations of Race 14.

What to know about rotating different sources of resistance:

  • Use PI 437654 type resistance (Hartwig) in fields with Race 14 populations
  • Hartwig is resistant to all races of SCN

What to know about rotating to non-host crops:

  • One year in a non-host crop (corn, cotton, soybean, peanut, rice and sweet potato) reduces SCN as much as 75%
  • Plant a non-host crop every third year
  • Follow a non-host crop with a resistant variety

Nematode-protectant seed treatments:

  • Thiabendazole 4L ST- early suppression only
  • Clariva pn- Biological seed treatment

Other need-to-knows about SCN:

  • Determining the race(s) present continues to be important from a prevention standpoint.
  • Monitoring areas where sudden death syndrome occurs in the presence of SCN continues to be important.
  • Rotation remains one of the best forms of yield loss prevention.

Mississippi State University Experts

Tom Allen | Plant Pathologist

Mississippi State University


Clarissa Balbalian | Plant Disease Diagnostician

Mississippi State University


Other SCN Management Resources