Bacterial leaf blight of Rice is caused by

Options

A. Erwinia
B. Xanthomonas
C. Pseudomonas
D. Alternaria

Answer

### Step-by-Step Solution:

1. **Identify the Disease**: The question asks about the causative agent of bacterial leaf blight of rice.

2. **Recognize the Options**: The options provided are Alvenia, Xanthomonas, Pseudomonas, and Alternaria.

3. **Determine the Correct Pathogen**: The bacterial leaf blight of rice is specifically caused by the bacterium **Xanthomonas**. More precisely, it is caused by **Xanthomonas oryzae**.

4. **Understand Characteristics of the Pathogen**:
- **Gram Staining**: Xanthomonas is a Gram-negative bacterium.
- **Oxygen Requirement**: It is aerobic, meaning it requires oxygen for growth.
- **Capsulation**: It is capsulated, which helps it evade the host's immune response.
- **Motility**: It is motile, possessing a single polar flagellum.

5. **Infection Process**: The primary infection occurs through infected seeds. The pathogen enters the plant through wounds and stomata.

6. **Symptoms of the Disease**: Symptoms include the appearance of linear yellow to straw-colored strips on the edges of the leaves. As the disease progresses, the leaves may dry out and twist, particularly at the tips.

7. **Destructive Phase**: The most destructive phase of the disease is known as "Akrasic" or wilt, which results from early systemic infection.

8. **Final Answer**: Based on the information, the correct answer to the question is **Xanthomonas**.