Which fungus causes early blight of potato?

Explanation

**Step-by-Step Solution:**

1. **Identify the Disease**: The question asks about the fungus that causes early blight in potatoes. Early blight is a common disease that affects potato plants.

2. **Recognize the Pathogen**: Early blight is caused by a specific type of pathogen. In this case, the pathogen is a fungus.

3. **Name the Fungus**: The fungus responsible for causing early blight in potatoes is known as *Alternaria solani*.

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