Ergot (of Rye ) is obtained from

Options

A. Claviceps
B. Phytophthora
C. Uncinula
D. Ustilago

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the origin of "ergot of rye." We need to identify the organism responsible for this condition.

2. **Identifying the Disease**: Ergot of rye is a disease that primarily affects rye plants but can also impact other cereal crops and forage plants.

3. **Identifying the Causative Agent**: The disease is caused by a specific type of fungus. The genus of this fungus is **Claviceps**.

4. **Understanding the Impact on Plants**: The ergot fungus infects the ovaries of the rye plant, which are crucial for sexual reproduction. This infection leads to significant crop losses because it affects the plant's ability to produce grains and seeds.

5. **Conclusion**: Based on the information gathered, we conclude that ergot of rye is obtained from the fungus of the genus **Claviceps**.

6. **Selecting the Correct Answer**: Therefore, the correct answer to the question is **option A**, which states that ergot of rye is caused by fungi of the genus Claviceps.