Southern Blight on Tomato
Note the small, spherical fruiting bodies (sclerotia) developing on the surface of the stem. The sclerotia can survive in the soil for many years without a host.

Southern blight on infected tomato stem.
White Mold on Cabbage
White mold on cabbage producing large, black fruiting bodies (sclerotia). The sclerotia can survive in the soil for many years without a host present.

White Mold on Cabbage