Select the correct option w.r.t. causative organism of ergot of bajra and powdery mildew, respectively.

Options

A. Claviceps perpurea and Erysiphe graminicola
B. Penicilium roqueforti and Fusarium moniliforme
C. Claviceps microcephala and Erysiphe graminicola
D. Gibberella fujikuroi and Fusarium moniliforme

Answer

To solve the question regarding the causative organisms of ergot of bajra and powdery mildew, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Diseases**:
- The question mentions two diseases: ergot of bajra and powdery mildew.
- Ergot of bajra is a fungal disease that affects the bajra plant (also known as pearl millet).
- Powdery mildew is a fungal disease that affects various plants, including tobacco.

2. **Determine the Causative Organisms**:
- For **ergot of bajra**, the causative organism is **Claviceps purpurea**. This fungus specifically infects bajra and causes the characteristic ergot disease.
- For **powdery mildew**, the causative organism is **Erysiphe graminis** (often referred to as Erysiphe graminicola). This fungus is known for causing powdery mildew on many plants, including tobacco.

3. **Match the Organisms to the Diseases**:
- Now that we have identified the causative organisms, we can summarize:
- Ergot of bajra → Claviceps purpurea
- Powdery mildew → Erysiphe graminis (Erysiphe graminicola)

4. **Select the Correct Option**:
- Based on the information gathered, the correct option regarding the causative organisms for ergot of bajra and powdery mildew is:
- **Claviceps purpurea** for ergot of bajra
- **Erysiphe graminis** for powdery mildew

### Conclusion:
The correct answer to the question is the first option, which states that the causative organism of ergot of bajra is **Claviceps purpurea** and for powdery mildew is **Erysiphe graminis**.