White Rot of Onions

Sclerotium cepivorum


A fungal disease causing yellowing and death of leaves. The base of the Onion is rotted and have white fluffy hyphal growth with many black spore bodies or sclerotia about 1 mm round. The root system may be totally destroyed making the plants easy to pull from the ground.

Species Affected:

Leeks, Shallots and Onions.


Produces sclerotia which may survive in the soil for many years.

Sclerotia are spread in soil on equipment and shoes.

Life Cycle:

Origin and History:



It can make an area unviable to crop to sensitive species.

Management and Control:

Grow Onions from seed of use healthy seedling from clean sources.

Remove and destroy diseased plants.

Don't plant infected areas with susceptible species and take measures to prevent soil leaving the area by washing implements and footwear etc.

Related and Similar Species:




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