Final diagnosis


Sclerotium rolfsii (Stem rot or Southern blight)

Mycelium invade stem bases and progress by invading the tubers. <i><b>Sclerotium rolfsii</i></b> (stem rot)
Spectacular symptoms of numerous sclerotia bursting out of rotten tubers. <i><b>Sclerotium rolfsii</i></b> (stem rot)