Babanrao is an organic farmer growing ladyfingers in this field. What are the precautions he will take to control pests in his field ?
I. Use of ladybird and dragonflies to control butterfly cartepillars .
II. Use of Nucleopolyhedrovirus to control arthropods .
III. Use of Bacillus thuringiensis to control butterfly caterpillars .
IV. Use of Trichoderma to control arthropods .

Options

A. I , III,
B. II, III
C. III , IV
D. I , IV

Answer

To determine the precautions Babanrao, an organic farmer growing ladyfingers, should take to control pests in his field, we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Option I: Use of ladybird and dragonflies to control butterfly caterpillars.**
- Ladybirds and dragonflies are beneficial insects that can help control certain pest populations. However, they can also damage crops, including ladyfingers. Therefore, this option is not a suitable precaution for pest control in this context.
- **Conclusion:** This option is incorrect.

2. **Option II: Use of Nucleopolyhedrovirus to control arthropods.**
- Nucleopolyhedrovirus is a biological control agent that targets specific insect pests, particularly moths and butterflies. It is effective against caterpillars and is considered a safe method for organic farming. Thus, this option is a valid precaution for pest control.
- **Conclusion:** This option is correct.

3. **Option III: Use of Bacillus thuringiensis to control butterfly caterpillars.**
- Bacillus thuringiensis (Bt) is a bacterium that produces toxins harmful to certain insects, particularly caterpillars. It is widely used in organic farming to control pests without harming beneficial insects. Therefore, this option is also a valid precaution.
- **Conclusion:** This option is correct.

4. **Option IV: Use of Trichoderma to control arthropods.**
- Trichoderma is a fungus used primarily for controlling fungal pathogens and is not effective against arthropods (insects). It is not a suitable option for controlling caterpillars or other insect pests.
- **Conclusion:** This option is incorrect.

### Final Evaluation:
- The correct precautions Babanrao can take to control pests in his field are:
- **Option II**: Use of Nucleopolyhedrovirus to control arthropods.
- **Option III**: Use of Bacillus thuringiensis to control butterfly caterpillars.

### Answer:
The precautions Babanrao will take to control pests in his field are **II and III**.