In packed produce, fist-sized nests of rotting tissue may develop. Both types of the fungus produce similar damage. The main difference seen is in the size of the sclerotes formed, Sclerotinia sclerotiorum being the larger of the two. Rotting of cabbage head and leaves by Sclerotinia . Well-advanced infection of brussel sprouts by Sclerotinia sclerotiorum .
Sclerotinia rot at the base of celery stalks.
Pod rot of beans, showing production mycelium and immature sclerotes. The infection cycle may conveniently be considered to begin with the sclerote. This may germinate to produce mycelium of the fungus, which can directly invade the plant, causing damage near the soil surface. These spores are readily moved by wind or water splash on to surrounding crops. They may be blown considerable distances, infecting neighbouring crops.