White spots on mustard leaves infection is caused by

Options

A. Toad stools
B. Albugo
C. Puccinia
D. Ustilago

Answer

**Step-by-Step Solution:**

1. **Identify the Symptoms**: The question mentions "white spots on mustard leaves." This indicates a specific type of plant disease.

2. **Recognize the Disease**: The white spots on mustard leaves are indicative of a disease known as "white rust."

3. **Determine the Causative Agent**: White rust is caused by a specific type of fungus. In this case, it is important to identify the exact fungus responsible for this disease.

4. **Identify the Fungus**: The fungus that causes white rust in crucifers (the family to which mustard belongs) is called *Albugo candida*.

5. **Classify the Fungus**: *Albugo candida* is classified as an obligate parasite, meaning it can only grow on living host plants, specifically those in the crucifer family.

6. **Evaluate Other Options**: The question provides multiple-choice options.
- Option 1 mentions Toadstool, which refers to poisonous mushrooms and is not related to mustard leaves.
- Option 3 mentions Paxinia, which is associated with stem rust and does not cause white rust.
- Option 4 mentions Stilago, which is a smut fungus causing smut disease, not white rust.

7. **Select the Correct Answer**: Based on the information, the correct answer is option 2, which identifies *Albugo candida* as the causative agent of white rust on mustard leaves.

**Final Answer**: The infection causing white spots on mustard leaves is caused by the fungus *Albugo candida*.

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