______is a viral disease that affects cotton crops.

Options

A. Wilting
B. Leaf curl
C. Rusting
D. Blight of potato

Answer

The viral disease that affects cotton crops is known as "leaf curl." This disease is caused by a virus classified under the family Gemini Viridae. Leaf curl leads to the curling of leaves in cotton plants, which can severely impact their growth and yield.

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for a viral disease that affects cotton crops.

2. **Consider Possible Options**: The options provided include wilting, leaf curls, rusting, and blight of potato.

3. **Analyze Each Option**:
- **Wilting**: This condition is not viral; it is typically caused by fungi or bacteria and refers to the drooping of leaves or flowers.
- **Leaf Curls**: This is caused by a virus from the Gemini Viridae family, which specifically affects cotton crops by causing the leaves to curl.
- **Rusting**: This condition is caused by fungal activity and results in spots on plants, not a viral disease.
- **Blight of Potato**: This is also caused by a fungus and affects potato plants, not cotton.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is "leaf curls," as it is the only option that is a viral disease affecting cotton crops.

5. **Final Answer**: Leaf curl is the viral disease that affects cotton crops.