• Damping-off of carrot seedlings and a crown rot later and during storage
• Field symptoms include premature senescence and death of foliage
• On carrot roots - dark brown sunken lesions or cankers near the crown or in other parts of the root – cavity spot

• Sclerotia - irregular, brown to black and 5mm in diameter
• Fungus produces both terminal and intercalary, barrel shaped chlamydospore

Mode of spread and survival:

• R. solani overwinters in soils as mycelia on plant debris and as dark brown sclerotia that remain in soil for long periods
• R. solani can spread from plant to plant in closely spaced carrots when the canopy is fully formed
  

• More severe on muck-grown carrots 
• Warm temperatures and wet conditions - especially when these environmental conditions occur near harvest

Management:

• Cultural practices that reduce crown injury and enhance soil drainage and air circulation within the canopy are recommended
• Plant debris from previous crops should be removed before planting carrots
• Carrots should not follow perennial crops such as alfalfa
• Quintozene – sprayed in the soil before sowing-effective control