What causes Loose smut of wheat?

-Loose smut of wheat is caused because of a fungus Ustilago tritici.
-A plant infected from it generally produces the head earlier than the healthy plants.
Organism: Fungi
Pathogen: Ustilago tritici
Plant Disease: Loose smut of wheat
Pathogen: Ustilago hordei
Plant Disease: Covered smut of barley
Pathogen: Ustilago kolleri
Plant Disease: Covered smut of oat
Pathogen: Ustilago avenae
Plant Disease: Loose smut of oat