Which of the following is not a consequence of using ethephon ?

Options

A. Thinning of cotton
B. Hastened fruit ripening in tomatoes
C. Accelerated abscission
D. Promotion of male flowers in cucumbers

Answer

To solve the question, we need to identify which of the given options is not a consequence of using ethephon. Ethephon is a plant growth regulator that releases ethylene, which has several effects on plant growth and development. Let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Ethephon**: Ethephon is a plant growth regulator that releases ethylene when it is absorbed by plants. It is used to accelerate various physiological processes in plants.

2. **Analyzing the Options**:
- **Thinning of Cotton**: Ethephon is known to promote the thinning of cotton by causing the abscission of some flowers and fruits, which is a consequence of its use.
- **Hazard**: This option is vague and does not specifically relate to a direct consequence of using ethephon. It could refer to potential negative effects, but it is not a specific consequence.
- **Fruit Ripening in Tomatoes**: Ethephon is widely used to promote fruit ripening, especially in tomatoes. This is a well-known consequence of using ethephon.
- **Accelerated Abscission**: Ethephon accelerates the process of abscission (the shedding of leaves, flowers, or fruits). This is also a recognized consequence of using ethephon.
- **Promotion of Male Flowers in Cucumbers**: Ethephon typically promotes female flowers in cucumbers, which are more desirable for fruit production. Therefore, promoting male flowers is not a consequence of using ethephon.

3. **Identifying the Correct Answer**: Based on the analysis, the option that is not a consequence of using ethephon is the promotion of male flowers in cucumbers.

### Final Answer:
The correct answer is: **Promotion of male flowers in cucumbers**.