Cycle - virtually all survival is in sclerotia, but infected perennial plants may harbor mycelial infections. Most infection is from primary inoculum. Secondary cycles are very limited. Sclerotia are difficult to kill. Avoid excess moisture and space plants widely to allow ventilation.
Fungicides are of little value.
PCNB is effective but has limited registration. Southern blight, mustard-seed root rot a. Recognized by production of small sclerotia which look very much like mustard seeds on the surface of infected plants. Also produces dense, flat plaques of mycelium on host surface on which sclerotia are formed. Teleomorph is the basidiomycete Pellicularia rolfsii, but it plays no practical role in the life cycle.