Find the odd one out ( with respect to bioherbicide) :

Options

A. Cactoblastis cacatorum
B. Heianthus anus
C. Phytophtora palmivora
D. Cochliomyia

Answer

### Step-by-Step Solution:

1. **Understanding Bioherbicides**:
- Bioherbicides are biological agents, including microorganisms and insects, that are used to control specific weeds. They are environmentally friendly alternatives to chemical herbicides.

2. **Analyzing the Options**:
- **Option A: Cactoblastis cactorum**: This is known as the cactus moth and is used as a bioherbicide to control specific weeds. Therefore, it is not the odd one out.

- **Option B: Helianthus annuus**: Commonly known as marigold, this plant is also used as a bioherbicide against canary grass. Hence, it is not the odd one out.

- **Option C: Phytophthora palmivora**: This organism is recognized as the first bioherbicide used against fungus, making it a valid example of a bioherbicide. Thus, it is not the odd one out.

- **Option D: Cochliomyia**: This is a livestock pest that affects animals and does not serve as a bioherbicide. It is a parasite that damages livestock, making it unrelated to the bioherbicide category.

3. **Identifying the Odd One Out**:
- After analyzing all the options, it is clear that **Cochliomyia** is the only one that does not fit into the category of bioherbicides. Therefore, it is the odd one out.

### Final Answer:
**Cochliomyia** is the odd one out with respect to bioherbicides.

---