Neck rot

Neck rot affects onions from the allium family.

recognize neck rot
Onion neck rot, photo Lester E. Dickens - CC BY 3.0

Neck rot (Botrytis aclada or Botrytis allii ). This fungus affects onions from the garlic family (Allium). The bulb rots away from the head and this often becomes apparent only after harvest. Neck rot often arises from contaminated seed and contamination of waste heaps on which onion leaves lie. Neck rot can survive in the soil.

Where to find


After infestation by neck rot, recovery is no longer possible. Do not throw the infested onions on the compost pile but with kerbside garden / food waste disposed of by the municipality.


Dry onions quickly after harvest, preventing any fungus from growing.