• Infected portions of the root become dark brown to black, water-soaked and rubbery in consistency
• Lesions may occur in one or more bands anywhere on the carrot root 
• White mycelia may be present on lesions, which facilitates the spread of the fungus to adjacent roots

Identification of pathogen:

Epidemiology :

• Relatively wet soil conditions from excessive rain/irrigation and temperatures between 70 to 75ºF

Mode of spread and survival:

• Soil borne
• Produces zoospores (swimming spores) - easily spread through water
  

Management:

• Maintaining adequate soil drainage
• Avoid prolonged periods of water saturation 
• Storage conditions - temperature at 32º F and RH <95%