Best method for insect control is

Options

A. (a) mechanical control
B. (b) physical control
C. (c) biological control
D. (d) both a) and b)

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the best method for insect control among the given options: A) Mechanical control, B) Physical control, C) Biological control, and D) Both A and B.

2. **Defining Control Methods**:
- **Mechanical Control**: This involves methods such as killing, removing, or setting up barriers to control pests. While effective to some extent, these methods are not 100% effective and can be time-consuming.
- **Physical Control**: This is closely related to mechanical control and includes similar methods aimed at pest management.
- **Biological Control**: This method uses certain organisms that act as antagonists to harmful insects, weeds, and mites. These organisms can kill pests through various means such as parasitism, herbivory, or competition.

3. **Evaluating Effectiveness**:
- Mechanical and physical controls are limited in effectiveness and efficiency. They require significant effort and may not completely eliminate the pest problem.
- Biological control, while not perfect, tends to be more effective in the long run as it utilizes natural processes and organisms to manage pest populations.

4. **Conclusion**: After evaluating the effectiveness of each method, biological control (C) is determined to be the best option among the choices provided.

5. **Final Answer**: The best method for insect control is **C) Biological control**.