Smut of Maize is due to

Options

A. Ustilago hordei
B. U. nuda
C. U. maydis
D. U. avenae.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the causative agent of "Smut of Maize". Smut of maize is a disease that affects corn (maize) and is caused by a specific type of fungus.

2. **Identifying the Options**: The options provided are:
- Option 1: Astilago hardy
- Option 2: Astilago nuda
- Option 3: Astilago mydes
- Option 4: Astilago avenue

3. **Analyzing Each Option**:
- **Option 1: Astilago hardy**: This option is incorrect as it does not cause smut disease in maize.
- **Option 2: Astilago nuda**: This option is also incorrect as it is not responsible for causing smut disease.
- **Option 3: Astilago mydes**: This is the correct option. Astilago mydes is a species of fungus that belongs to the class Basidiomycetes and is known to cause smut disease in maize.
- **Option 4: Astilago avenue**: This option is incorrect as it does not cause smut disease.

4. **Conclusion**: After analyzing all the options, the correct answer is **Option 3: Astilago mydes**.