Brown Stem Rot - Risk Assessment

Brown stem rot will have a greater negative effect on yield if temperatures are cool (64-75°F) in early August, followed by hot, dry weather during late pod-fill. Other factors that favor disease are short rotations, susceptible varieties, overwintered stem tissue, and the presence of SCN.

Seasonal Risk Factors for BSR Long-term risk factors for BSR
  • continuous soybeans
  • susceptible soybean variety
  • variety with long maturity
  • short rotations
  • low soil pH (less than 6.8)
  • history of brown stem rot 
  • virulent pathotype present
  • SCN present
  • rain or irrigation following flowering
  • cool air temperatures (less than 27°C)
  •  reduced tillage
  • no-till
  • slow residue decomposition
  • spread of soil from field to field

 
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