White Rot
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.
