In plants, which of the following disease is caused by bacteria?

Options

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

Answer

To determine which disease in plants is caused by bacteria, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option - Mosaic disease of tobacco
- **Explanation**: Mosaic disease affects tobacco plants and is caused by a virus, specifically the Mosaic virus.
- **Conclusion**: This option is incorrect since it is not caused by bacteria.

### Step 2: Analyze the second option - Citrus canker
- **Explanation**: Citrus canker is a disease that affects citrus plants and is caused by the bacterium Xanthomonas citri.
- **Conclusion**: This option is correct as it is caused by bacteria.

### Step 3: Analyze the third option - Late blight of potato
- **Explanation**: Late blight of potato is caused by a fungus known as Phytophthora infestans.
- **Conclusion**: This option is incorrect since it is not caused by bacteria.

### Step 4: Analyze the fourth option - Potato Spindle Tuber Disease
- **Explanation**: Potato Spindle Tuber Disease is caused by a type of virus known as a viroid.
- **Conclusion**: This option is also incorrect as it is not caused by bacteria.

### Final Conclusion:
After analyzing all the options, the only disease caused by bacteria is **Citrus canker**.

### Answer:
The correct answer is **Citrus canker** (Option 2).

---