Symptoms of red rot disease appear over

Options

A. Leaf tip
B. Whole leaf
C. Mid rid
D. Leaf margin

Answer

**Step-by-Step Solution:**

1. **Identify the Disease and Causative Agent**: The red rot disease is caused by the fungus *Colletotrichum falcatum*, which belongs to the group of fungi known as Deuteromycetes (imperfect fungi).

2. **Understand the Host**: This disease primarily affects sugarcane.

3. **Recognize the Symptoms**: The symptoms of red rot disease are most prominently observed on the midrib of the sugarcane leaves.

4. **Effects on Sugarcane**: The disease leads to a reduction in the juice content of the sugarcane and causes the leaves to wither.

5. **Fungal Characteristics**: The fungus develops sickle-shaped conidia, which are a type of asexual spore.

6. **Perfect Stage of the Fungus**: The perfect stage of this fungus is referred to as glomerula.

7. **Conclusion**: Based on the information, the symptoms of red rot disease appear most conspicuously on the midrib of the leaves.

8. **Final Answer**: Therefore, the correct answer to the question is that the symptoms of red rot disease appear on the **midrib** of the sugarcane leaves.

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