Symptoms

• Cells become water soaked, the middle lamella is destroyed and the cells collapse into a soft, watery slimy mass.
• The rotted tissues are grey to brown. they may be accomplished by a foul odour.
• The decay develops most rapidly along the core of the root.

Management

• Dipping in a solution of 1:500 of sodium hypochlorite before storage or transits reduce the disease.

Image Source:

http://pnwhandbooks.org/plantdisease/carrot-daucus-carota-soft-rot-core-soft-rot