What is the scientific name of smut?

Smut has three meanings

1. A dark-coloured particle coming from something that is burning; anything from a particle of soot to a small ember.
2. Obscene language
3. A disease of plants causing black spots or patches; almost always a fungus.

There is no scientific name for the first two. Number three refers to many different diseases of different plants; the scientific name (if any) will be different for each causative agent.