Fusion of two mycelial isolates indicates an anstomosis group. There are AG 1-9, and tester strains to help type the strains. Different AG's cause different types of diseases, often geographically separated but this is still under investigation. The fungus is cosmopolitan and temperature optima follow the local conditions usually. Control as always sanitation.
Fungicides work for specific diseases e.g. damping off in nursery situations etc.
Biocontrol is also being studied. Sclerotium rolfsii Behaves similar to Rhizoctonia , but generally produces black mycelia and produces rhizomorphs which are cord-like strands composed of many mycelia. Theses are often the colonizing entity. It grows on the surface of the ground under leaves or other litter, and will grow from plant to plant. It is slightly less aggressive than Rhizoctonia and doesn't produce damping off, but does cause stem rots.