Which of the following is not used as a biopesticide?

Options

A. Bacillus thuringiensis
B. Trichoderma harzianum
C. Nucleopolyhedrovirus (NPV)
D. Xanthomonas campestris

Answer

To determine which of the following is not used as a biopesticide, we need to analyze the options provided: Bacillus thuringiensis, Trichoderma hazarium, Nuclear polyhedrosis virus (NPV), and Xanthomonas campestris.

### Step-by-Step Solution:

1. **Understanding Biopesticides**:
- Biopesticides are natural organisms or substances derived from natural materials that control pests. They can include bacteria, fungi, viruses, and plant extracts.

2. **Analyzing Each Option**:
- **Bacillus thuringiensis**: This is a bacterium that produces a toxin (Bt toxin) effective against certain insect pests. It is widely used as a biopesticide.
- **Trichoderma hazarium**: This is a free-living fungus that acts as a biological control agent against various plant pathogens. It is also used as a biopesticide.
- **Nuclear polyhedrosis virus (NPV)**: This virus belongs to the baculovirus family and is known for targeting insects. It is used as a biopesticide to control insect pests.
- **Xanthomonas campestris**: This is a bacterium that causes diseases in plants, such as black rot in cruciferous vegetables. It is not used as a biopesticide because it is a pathogen itself.

3. **Conclusion**:
- Based on the analysis, the organism that is not used as a biopesticide is **Xanthomonas campestris**.

### Final Answer:
**Xanthomonas campestris** is not used as a biopesticide.

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