Red root rot
Area of impact: Stalk
Description: Roots turn a reddish color and the root mass can be reduced. The lower stalk turns deep red or purple then shrivels and dies. Rotting below ground can lead to wilting and graying foliage and plant death.
Pathogen involved: Phoma terrestris (a fungus)
Timing/Conditions: Occurs at midsilking, but usually happens late in the season during moderate weather.
Contributing factors: Overwinters in soil and can survive in a wide range of soils. Rate of disease development increases as the plant senesces. High-yield conditions contributes to disease development.
Management practices: Rotate corn with soybeans.