Yellow vein mosaic of Okra
Explanation
Plant diseases are classified based on the type of pathogen responsible, such as fungi, bacteria, or viruses.
- Rust of wheat is Incorrect: Rust of wheat is a fungal disease caused by fungi of the genus Puccinia. It is characterized by the appearance of rust-colored pustules on the stems and leaves.
- Citrus canker is Incorrect: Citrus canker is a bacterial disease caused by Xanthomonas citri. It affects citrus trees, leading to lesions on the leaves, stems, and fruit.
- Yellow vein mosaic of Okra is Correct: Yellow vein mosaic of Okra (Bhindi) is a viral disease caused by the Yellow Vein Mosaic Virus. The primary symptom is the clearing of veins, which turn yellow while the rest of the leaf remains green, often resulting in stunted growth and reduced yield.
- Anthrax is Incorrect: Anthrax is a bacterial disease caused by Bacillus anthracis. It primarily affects livestock and humans, not plants.
Key Takeaway: Yellow vein mosaic of Okra is a viral plant disease, distinct from Rust of wheat (fungal) and Citrus canker (bacterial).