White Rot

21/06/2026

Sclerotium cepivorum

White rot (Sclerotium cepivorum) is a devastating disease of onions in New Zealand, resulting in significant yield losses during epidemic seasons. It infects the roots and basal plates of bulbs causing a characteristic white mycelium and then a blackening rot of the base of the bulb. Early infections usually kill the whole plant but later infected bulbs spread rots in storage.

White Rot - Onions