Question

Fungi of the order 'Ustilaginales' mainly cause :

• A. Little leaf
• B. Rust
• C. Ergot
• D. Smut

Hint:

Smut = *Ustilago*. Think of "Soot" to remember "Smut." These fungi replace the grain with black spore masses.

Answer 1

The Correct Option is D

Concept: Plant pathogenic fungi are often classified based on the symptoms they produce and their taxonomic order.

Step 1: Identify the characteristics of Ustilaginales.
Fungi belonging to the order Ustilaginales are commonly known as the "Smut fungi." They are basidiomycetes that typically produce dark, dusty masses of teliospores (sooty appearance) in the reproductive organs of the host, particularly in cereals.

Step 2: Compare with other fungal diseases.
Rusts (2) are caused by the order *Pucciniales*. Ergot (3) is caused by the genus *Claviceps* (order *Hypocreales*). Little leaf (1) is generally caused by Phytoplasmas, not fungi. Therefore, Smut is the correct association for Ustilaginales.