Which disease is caused by bacteria in plant ?

Options

A. Late blight of potato
B. Mosaci disease of tobacco
C. Citrus canker
D. Potato spindle tuber disease

Explanation

To determine which disease is caused by bacteria in plants, we can analyze the given options step by step:

### Step 1: Analyze the first option - Late Blight of Potato
- Late Blight of Potato is caused by **Phytophthora infestans**, which is a type of **oomycete** (fungus).
- Since this disease is not caused by bacteria, we can eliminate this option.

**Hint:** Remember that oomycetes are not classified as true fungi but are often grouped with them due to similar characteristics.

### Step 2: Analyze the second option - Mosaic Disease of Tobacco
- Mosaic Disease of Tobacco is caused by a **virus**, specifically the **Mosaic Virus**.
- Since this disease is not caused by bacteria, we can eliminate this option as well.

**Hint:** Viruses are different from bacteria and require a host cell to replicate.

### Step 3: Analyze the third option - Citrus Canker
- Citrus Canker is caused by the bacterium **Xanthomonas axonopodis**.
- This disease affects the leaves, fruits, and stems of citrus plants, causing lesions.
- Since this disease is indeed caused by bacteria, we can consider this option as a valid answer.

**Hint:** Look for specific bacterial names associated with plant diseases to confirm bacterial infections.

### Step 4: Analyze the fourth option - Potato Spindle Tuber Disease
- Potato Spindle Tuber Disease is caused by a **viroid**, which is a type of infectious agent that is even smaller than a virus.
- Since this disease is not caused by bacteria, we can eliminate this option.

**Hint:** Viroids are unique pathogens that do not have a protein coat, distinguishing them from viruses.

### Conclusion
After analyzing all the options, the disease caused by bacteria in plants is **Citrus Canker**.

**Final Answer:** Citrus Canker