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Onion white rot

Onion white rot (whiterot). Harmful fungal disease that mainly affects crops from the Allium family (chives, garlic, leeks and onions).

recognize damage by onion white rot
Damage by onion white rot, photo: plantix.net

Onion white rot (Stromatinia cepivora, syn. Sclerotium cepivorum). Harmful fungal disease that mainly affects crops from the Allium family (chives, garlic, leeks and onions). Subsequent deterioration causes damage during storage.
Leaves yellow and thick, woolly fungal fluff develops on the roots and bulb. The oldest leaves fall off. Black fungal spots (sclerotia) develop on the affected parts, which cause further spread of the fungus. Spores are often present in large quantities in the soil and sometimes survive there for years.
Onion white rot can cause a lot of damage in professional Onion cultivation.

Where to find

Control

Damage to plants is irreversible. Removal of infested plants can prevent further spread in the environment. Not suitable for the compost pile.
Professional agriculture is experimenting with chemical control and biological control and breeding resistant species.

Prevention

Do not plant chives, garlic, leeks or onions on infected plots.