Which disease is wrongly matched ?

Options

A. White rust of crucifers-Cystopus candida
B. Ergot of rye-Claviceps purpurea
C. Damping opp-Pythium debaryanum
D. Late blight of potato-Alternaria solani

Answer

To determine which disease is wrongly matched with its causative agent, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the First Disease:**
- **Disease:** White rust of crucifers
- **Causative Agent:** *Albugo candida*
- **Analysis:** This is correctly matched. White rust is indeed caused by *Albugo candida*.

2. **Identify the Second Disease:**
- **Disease:** Eye spot of rye and agate of rice
- **Causative Agent:** *Cletotrichum graminicola*
- **Analysis:** This is also correctly matched. Eye spot disease is caused by *Cletotrichum graminicola*.

3. **Identify the Third Disease:**
- **Disease:** Damping off
- **Causative Agent:** *Pythium aphanidermatum*
- **Analysis:** This is correctly matched as well. Damping off is caused by *Pythium* species.

4. **Identify the Fourth Disease:**
- **Disease:** Late blight of potato
- **Causative Agent:** *Alternaria solani*
- **Analysis:** This is incorrectly matched. The correct causative agent for late blight of potato is *Phytophthora infestans*, not *Alternaria solani*. *Alternaria solani* is the causative agent of early blight of potato.

### Conclusion:
The disease that is wrongly matched is the **late blight of potato**, which is incorrectly associated with *Alternaria solani* instead of the correct causative agent *Phytophthora infestans*.

---